Nobody can answer your peoblem unless you post much details.

sorry,I will  presented detailed .
my question:
when I use the proc princomp:
SAS code:
filename routed 'h:\2.txt';
proc printto print=routed new;
run;
proc princomp data=sas.wheat out=prin outstat=ptest n=3 ;
var x1-x2151;run;
proc reg  data=sas.wheat outest=result outvif ;
model y1=x1-x2151/pcomit=2148 p;run;
之后再LOIG窗口：ERROR: R-Square is computed incorrectly. The SINGULAR= value may be too small.