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Supplementary Statistical Data
LAIT Norming #2
Kevin Langdon
The data presented here is intended to supplement the
Statistical Report which is sent with each LAIT score re-
port. This information is provided to give some idea of
how the test data was converted into I.Q. scores.
The Stanford-Binet and California Test of Mental Mat-
urity are known to produce too many high scores; therefore
scores on these tests were corrected in norming the LAIT.
Also, scores on several tests which were very near the
tests' ceilings were corrected upwards to compensate for
ceiling bumping.
The scatter diagram which appears below plots fre-
quencies of scores on I.Q. tests taken previously and re-
ported on testees' LAIT answer sheets against those of
LAIT raw scores. The numbers on the vertical and hori-
zontal axes represent the lower boundaries of score cat-
egories.
Circled numbers in the body of the diagram represent
outlying data points (bumps at the extremes of otherwise
smooth distributions). The two diagonal lines represent
the boundaries chosen between data used and discarded in
determining the scaling of LAIT scores to previous I.Q.
scores.
The numbers penciled in are values of LAIT and pre-
vious scores at the endpoints of these lines.
Return to the Uncommonly Difficult I.Q. Tests page.