Source, Notes, and Statistical Notations

Statistical notation is found at the end of a data table, if applicable to that table:

—  Not available.

†   Not applicable. (For instance, the statistic does not meet reporting standards, so the measure of dispersion for that statistic cannot be reported.)

‡   Reporting standards not met. (For instance, the sample size is insufficient to permit a reliable estimate.)

#  The statistic rounds to zero.

NOTE: pertains to any special characteristics of the data in the table.

SOURCE: information is listed for all NAEP data, below the table or chart, and should be cited when data are used in a publication or presentation.