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Example 18
About the Data
For this example, the Attig data (introduced in Example 1) was modified by
eliminating some of the data values and treating them as missing. A portion of the
modified data file for young people, Atty_mis.sav, is shown below as it appears in the
SPSS Statistics Data Editor. The file contains scores of Attig’s 40 young subjects on
the two vocabulary tests v_short and vocab. The variable vocab is the WAIS vocabulary
score. V_short is the score on a small subset of items on the WAIS vocabulary test.
Vocab scores were deleted for 30 randomly picked subjects.
A second data file, Atto_mis.sav, contains vocabulary test scores for the 40 old
subjects, again with 30 randomly picked vocab scores deleted.