The visread.data is the data from Example 8 in the AMOS online
Examples.  That is, it is from Holzinger and Swineford (1939)
psychological testing data.  The first 6 columns represent 6 different tests
taken by 145 students in 7th and 8th grade from two Chicago schools,
and the last column represents the gender of the test taker.

The columns are in this order:
1. visperc (Visual Perception)
2. cubes 
3. lozenges 
4. paragrap (Paragraph Comprehension)
5. sentence (Sentence Comprehension)
6. wordmean (Word Meaning)
7. gender