Calculating age equivalent scores

An age equivalent is defined as the chronological age range of students that would be expected to achieve a given raw score or adaptive score. Age equivalents are designed to be used only in exceptional circumstances, e.g. for students in special education where centile norms are not always helpful. Age equivalents should not be used routinely in cases where centile norms are applicable, because age equivalents give only a very rough approximation of the student’s ability. For an explanation of this issue, please see Section 2.3.15.

To calculate the age equivalent for any LASS 11-15 score, first find the student’s Raw Score (or Adaptive Score, in the case of the adaptive tests) for that test by consulting the relevant Data Table in the Report Generator (for an explanation of how to do this see Section 2.4.3.2). Next, locate the corresponding score (or score range) in the body of Table 8 (page 103). The age equivalent for that score is given in the left-hand column of the table on the same row. Note that it is not possible to calculate age equivalent scores for the Single Word Reading Test — for explanation and examples see Section 4.5.

Table 8. Table of Age Equivalents for LASS 11-15 Tests.

RS = Raw Score (i.e. number correct on the test) [Progressive Tests]

AS = Adaptive Score expressed as a percentage (e.g. 0.5792 rounded to 0.58 = 58%) [Adaptive Tests]