*******
From BK example 3.27
1. a non-verbal measure of general intelligence
2. picture completion test
3. block design
4. mazes
5. reading comprehension
6. vocabulary
************************;





**** Reading in the correlation matrix from page 69 of BK;


data bk327(type=corr);
_TYPE_ = 'CORR';
input _TYPE_  $_NAME_ $ x1-x6;
datalines;
CORR x1    1     .     .       .      .   .
CORR x2 .466     1     .       .      .   .
CORR x3 .552  .572     1       .      .   .
CORR x4 .340  .193  .445       1      .   .
CORR x5 .576  .263  .354    .184      1   .
CORR x6 .510  .239  .356    .219   .794   1
N    .   112   112   112     112    112   112
STD  .   5.161492  2.588436 12.240547  3.565249  7.252862 11.631509
;

option linesize =  70;


 proc factor data = bk327 scree method = ml;
         var x1-x6; run;