WLS Codebooks

Note: Codebooks contain frequency data from the private data release. For some variables, these differ from the frequencies in the public release. Variables that differ between the public and private versions include "(not available on public release)" as part of the variable description, or a note indicating the difference between the public and private versions.

1957 - IQ

The recommended IQ measures are gwiiq_bm for graduates and swiiq_t for
siblings.  

These measures include imputed junior year Henmon-Nelson scores. The
imputations were based on scores from other grades, the Wisconsin Centile Rank,
and the IOWA test. 

Imputed cases can be identified using the variable gflag_bm. 

The end of the variable name represents whether it is the preferred measures
(bm), from junior year (j) or from freshman year (f)

There were a variety of errors in iq variables used prior to February 1998.
These variables - IQ IQSCOR IQERR IQHNQ IQHNSCRQ IQJCR IQJSCOR IQFCR IQFSCOR
IQJRS IQFRS - have been moved to the archives and are not recommended to be
used unless replicating previous studies.



gwiiq_*     IQ score mapped from raw Henmon-Nelson test score
ghnrs_*     Raw Henmon-Nelson test score
ghncr_*     Centile rank based on National test takers for Henmon-Nelson score
gwicr_*     Centile rank based on Wisconsin test takers for Henmon-Nelson score
gflag_*     Source of Henmon-Nelson raw score

gagecm_j    Age in months when junior year Henmon-Nelson test was taken
gagecm_f    Age in months when freshman year Henmon-Nelson test was taken
gtdate_f    Date when graduate took freshman year Henmon-Nelson test.

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