​​​​​NAEP Technical DocumentationIndex Scoring for the 2019 Grade 8 Science Indices

Recoding of polytomous items for scaling, grade 8 science PBA national assessment, by index: 2019
Item Index Reason for decision Disposition
PBA = Paper-based assessment.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B034901 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034902 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034903 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034904 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035001 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035002 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035003 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035004 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035101 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035102 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035103 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035104 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823801 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823802 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823803 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823804 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823805 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823806 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823601 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823602 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823603 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823604 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
​

Recoding of polytomous items for scaling, grade 8 science DBA national assessment, by index: 2019
Item Index Reason for decision Disposition
DBA = Digitally based assessment.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B034901 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034902 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034903 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B034904 Persistence in learning To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035001 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035002 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035003 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035004 Academic self-discipline To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035101 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035102 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035103 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
B035104 Enjoyment of complex problems To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823801 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823802 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823803 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823804 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823805 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823806 Interest/enjoyment in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823601 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823602 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823603 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
K823604 Mastery goals in science To improve model-data fit Collapse categories: 1,2,3,4,5 becomes 1,1,2,3,4
​

IRT parameters for items in the index of eighth-grade students' persistence in learning, grade 8 science PBA national assessment: 2019
Item b d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B034901 -0.24 0.99 0.12 -1.11
B034902 -0.52 0.80 0.05 -0.85
B034903 -0.29 0.73 0.04 -0.77
B034904 -0.75 0.64 0.04 -0.68
​

IRT parameters for items in the index of eighth-grade students' persistence in learning, grade 8 science DBA national assessment: 2019
Item b d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B034901 -0.27 0.99 0.07 -1.06
B034902 -0.47 0.77 0.07 -0.84
B034903 -0.29 0.77 0.00 -0.77
B034904 -0.73 0.63 -0.01 -0.62
​

IRT parameters for items in the index of eighth-grade students' enjoyment of complex problems, grade 8 science PBA national assessment: 2019
Item b d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B035101 0.72 0.68 0.07 -0.75
B035102 0.12 0.67 0.02 -0.68
B035103 0.22 0.67 0.08 -0.75
B035104 0.14 0.57 0.08 -0.65
​

IRT parameters for items in the index of eighth-grade students' enjoyment of complex problems, grade 8 science DBA national assessment: 2019
Item b d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B035101 0.59 0.75 -0.05 -0.70
B035102 0.05 0.73 -0.03 -0.70
B035103 0.12 0.74 0.02 -0.75
B035104 0.01 0.64 0.01 -0.65
​

IRT parameters for items in the index of eighth-grade students' academic self-discipline, grade 8 science PBA national assessment: 2019
Item b d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B035001 0.02 0.76 0.03 -0.79
B035002 -0.09 0.89 0.12 -1.01
B035003 -0.36 0.66 0.08 -0.74
B035004 -0.16 0.67 0.08 -0.75
​

IRT parameters for items in the index of eighth-grade students' academic self-discipline, grade 8 science DBA national assessment: 2019
Item b d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
B035001 0.10 0.73 -0.02 -0.72
B035002 -0.07 0.92 0.06 -0.97
B035003 -0.34 0.70 0.05 -0.75
B035004 -0.21 0.72 0.03 -0.75
​

IRT parameters for items in the index of eighth-grade students' confidence in science knowledge and skills, grade 8 science PBA national assessment: 2019
Item b d d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823402 0.06 1.03 0.60 -0.43 -1.20
K823403 -0.57 0.86 0.54 -0.28 -1.12
K823405 -0.63 0.64 0.35 -0.24 -0.76
K823406 -0.31 0.88 0.45 -0.38 -0.95
​

IRT parameters for items in the index of eighth-grade students' confidence in science knowledge and skills, grade 8 science DBA national assessment: 2019
Item b d d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823402 -0.01 0.96 0.58 -0.38 -1.16
K823403 -0.61 0.86 0.52 -0.29 -1.08
K823405 -0.62 0.64 0.40 -0.30 -0.73
K823406 -0.35 0.89 0.48 -0.42 -0.95
​

IRT parameters for items in the index of eighth-grade students' performance goals in science, grade 8 science PBA national assessment: 2019
Item b d d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823501 0.22 0.83 0.54 -0.28 -1.10
K823502 0.48 0.78 0.42 -0.28 -0.92
K823503 0.36 0.60 0.30 -0.17 -0.73
K823504 -0.49 0.72 0.25 -0.24 -0.73
​
​
IRT parameters for items in the index of eighth-grade students' performance goals in science, grade 8 science DBA national assessment: 2019
Item b d d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823501 0.12 0.80 0.63 -0.37 -1.06
K823502 0.31 0.77 0.50 -0.36 -0.91
K823503 0.21 0.58 0.44 -0.32 -0.70
K823504 -0.54 0.75 0.32 -0.32 -0.75
​

IRT parameters for items in the index of eighth-grade students' mastery goals in science, grade 8 science PBA national assessment: 2019
Item b d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823601 -0.21 0.86 0.08 -0.93
K823602 -0.64 0.71 0.15 -0.86
K823603 -0.79 0.72 0.15 -0.88
K823604 -0.38 0.70 0.08 -0.78
​

IRT parameters for items in the index of eighth-grade students' mastery goals in science, grade 8 science DBA national assessment: 2019
Item b d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823601 -0.31 0.95 -0.01 -0.94
K823602 -0.66 0.78 0.06 -0.84
K823603 -0.80 0.79 0.06 -0.85
K823604 -0.43 0.77 -0.05 -0.73
​

IRT parameters for items in the index of eighth-grade students' interest/enjoyment in science, grade 8 science PBA national assessment: 2019
Item b d d d
PBA = Paper-based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823801 0.06 0.75 0.14 -0.88
K823802 0.33 0.55 0.09 -0.64
K823803 0.18 0.68 0.08 -0.76
K823804 -0.23 0.69 0.12 -0.81
K823805 0.16 0.47 0.08 -0.55
K823806 -0.67 0.56 0.11 -0.67
​

IRT parameters for items in the index of eighth-grade students' interest/enjoyment in science, grade 8 science DBA national assessment: 2019
Item b d d d
DBA = Digitally based assessment. The number of d parameters is one less than the number of categories for the item. For items scaled with the partial credit model, parameters a and c are not estimated. The a parameter value is exactly one and the c parameter is exactly zero. For item j, b represents a location parameter related to item difficulty, and d represents the category threshold parameter for category i of item j; d may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
K823801 -0.05 0.81 0.03 -0.84
K823802 0.22 0.64 0.00 -0.64
K823803 0.08 0.76 0.01 -0.77
K823804 -0.26 0.77 0.06 -0.83
K823805 0.12 0.54 0.01 -0.56
K823806 -0.63 0.64 0.00 -0.64
​

Response averages and transformed scores for the index of eighth-grade students' persistence in learning, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.9 2
1.25 6.7 3
1.50 7.3 4
1.75 7.9 4
Moderate
2.00 8.3 6
2.25 8.7 6
2.50 9.2 9
2.75 9.6 10
High
3.00 10.1 11
3.25 10.6 12
3.50 11.2 12
3.75 11.9 11
4.00 13.0 10
​

Response averages and transformed scores for the index of eighth-grade students' persistence in learning, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.9 3
1.25 6.8 3
1.50 7.4 4
1.75 7.9 4
Moderate
2.00 8.3 7
2.25 8.8 6
2.50 9.2 9
2.75 9.6 9
High
3.00 10.1 12
3.25 10.6 11
3.50 11.2 12
3.75 11.9 11
4.00 12.9 11
​

Response averages and transformed scores for the index of eighth-grade students' enjoyment of complex problems, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 7.1 14
1.25 8.0 8
1.50 8.7 8
1.75 9.2 8
Moderate
2.00 9.7 10
2.25 10.1 8
2.50 10.5 9
2.75 10.9 7
High
3.00 11.3 8
3.25 11.8 6
3.50 12.3 5
3.75 12.9 4
4.00 13.8 5
​

Response averages and transformed scores for the index of eighth-grade students' enjoyment of complex problems, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.9 12
1.25 7.8 7
1.50 8.5 7
1.75 9.0 8
Moderate
2.00 9.5 11
2.25 9.9 8
2.50 10.3 8
2.75 10.7 8
High
3.00 11.2 8
3.25 11.6 6
3.50 12.1 5
3.75 12.8 5
4.00 13.6 6
​

Response averages and transformed scores for the index of eighth-grade students' academic self-discipline, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.4 4
1.25 7.3 4
1.50 7.9 5
1.75 8.4 6
Moderate
2.00 8.9 8
2.25 9.3 9
2.50 9.7 10
2.75 10.1 10
High
3.00 10.6 11
3.25 11.1 10
3.50 11.6 9
3.75 12.3 7
4.00 13.3 6
​

Response averages and transformed scores for the index of eighth-grade students' academic self-discipline, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.4 4
1.25 7.3 4
1.50 7.9 5
1.75 8.4 6
Moderate
2.00 8.9 9
2.25 9.3 8
2.50 9.8 10
2.75 10.2 11
High
3.00 10.6 11
3.25 11.1 9
3.50 11.6 9
3.75 12.3 6
4.00 13.3 6
​

Response averages and transformed scores for the index of eighth-grade students' confidence in science knowledge and skills, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.8 2
1.25 6.5 1
1.50 7.1 1
1.75 7.5 2
2.00 7.9 3
2.25 8.2 4
2.50 8.6 6
2.75 8.9 7
Moderate
3.00 9.2 11
3.25 9.6 10
3.50 9.9 12
3.75 10.3 11
High
4.00 10.7 11
4.25 11.2 8
4.50 11.8 6
4.75 12.4 4
5.00 13.4 3
​

Response averages and transformed scores for the index of eighth-grade students' confidence in science knowledge and skills, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
Rounds to zero.
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.8 3
1.25 6.5
1.50 7.0 1
1.75 7.5 2
2.00 7.9 3
2.25 8.2 3
2.50 8.5 5
2.75 8.9 6
Moderate
3.00 9.2 12
3.25 9.5 9
3.50 9.9 10
3.75 10.3 10
High
4.00 10.7 11
4.25 11.1 8
4.50 11.7 6
4.75 12.4 5
5.00 13.3 5
​

Response averages and transformed scores for the index of eighth-grade students' performance goals in science, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.6 6
1.25 7.4 5
1.50 8.0 6
1.75 8.5 6
2.00 8.9 9
2.25 9.3 7
2.50 9.6 7
2.75 9.9 6
Moderate
3.00 10.2 8
3.25 10.5 7
3.50 10.8 6
3.75 11.2 5
High
4.00 11.6 6
4.25 12.0 4
4.50 12.5 4
4.75 13.1 2
5.00 13.9 5
​

Response averages and transformed scores for the index of eighth-grade students' performance goals in science, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.4 5
1.25 7.2 4
1.50 7.8 5
1.75 8.3 5
2.00 8.7 8
2.25 9.0 6
2.50 9.4 7
2.75 9.7 7
Moderate
3.00 10.0 10
3.25 10.3 7
3.50 10.6 7
3.75 11.0 6
High
4.00 11.4 7
4.25 11.8 4
4.50 12.3 4
4.75 12.9 3
5.00 13.7 7
​

Response averages and transformed scores for the index of eighth-grade students' mastery goals in science, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.8 6
1.25 6.6 3
1.50 7.2 3
1.75 7.8 4
Moderate
2.00 8.2 7
2.25 8.6 5
2.50 9.1 7
2.75 9.5 8
High
3.00 10.0 12
3.25 10.5 8
3.50 11.1 8
3.75 11.8 9
4.00 12.9 21
​

Response averages and transformed scores for the index of eighth-grade students' mastery goals in science, grade 8 science DBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 5.7 6
1.25 6.5 3
1.50 7.2 3
1.75 7.7 4
Moderate
2.00 8.2 8
2.25 8.6 5
2.50 9.0 6
2.75 9.5 8
High
3.00 9.9 12
3.25 10.4 6
3.50 11.0 7
3.75 11.8 8
4.00 12.8 24
​

Response averages and transformed scores for the index of eighth-grade students' interest/enjoyment in science, grade 8 science PBA national assessment, by classification: 2019
Response average Transformed score Percentage of students
PBA = Paper-based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.00 6.2 5
1.17 7.0 3
1.33 7.6 3
1.50 8.0 5
1.67 8.4 5
1.83 8.8 5
Moderate
2.00 9.1 7
2.17 9.4 6
2.33 9.7 6
2.50 9.9 6
2.67 10.2 6
2.83 10.5 6
High
3.00 10.8 7
3.17 11.1 5
3.33 11.5 4
3.50 11.8 5
3.67 12.3 4
3.83 12.9 4
4.00 13.8 7
​

Response averages and transformed scores for the index of eighth-grade students' interest/enjoyment in science, grade 8 science DBA national assessment, by classification: 2019
Response averageTransformed scorePercentage of students
DBA = Digitally based assessment. Detail may not sum to totals because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Low
1.006.15
1.176.93
1.337.53
1.507.94
1.678.34
1.838.75
Moderate
2.009.08
2.179.35
2.339.66
2.509.86
2.6710.16
2.8310.46
High
3.0010.78
3.1711.05
3.3311.45
3.5011.85
3.6712.24
3.8312.84
4.0013.79
​
Last updated 31 March 2025 (SK)