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Frequently Asked Questions


Proficiency Probabilities

What are the proficiency probabilities on the data file?

The ECLS-B data file includes 20 proficiency probability scores from the 9-month and 2-year direct child assessments: 10 from the Mental Scale and 10 from the Motor Scale. The individual proficiencies are described in the User's Manual. Each proficiency probability was generated from the child's estimated performance on 4 to 6 assessment items and represents the probability that the child has mastered the skill represented by that proficiency. Thus, the proficiency probability scores range from 0 1. The proficiency probabilities are informative in that they indicate where growth has occurred (i.e., in what skills), whereas gains in scale scores only indicate that growth has occurred. That is, two children may have both gained the same number of points on the BSF-R mental scale, for example, but in different places. The proficiency probabilities could show that the first child has mastered jabbering expressively, but the second child had already mastered that skill and is working on mastery of expressive vocabulary. Currently, the ECLS B provides proficiency probabilities for the 9-month and 2-year BSF-R mental and motor assessments on the longitudinal 9-month—kindergarten 2007 restricted-use data file. Proficiency probabilities for the preschool kindergarten cognitive assessments are not currently available.

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