Help using Base SAS procedures

proc reg and almost zero rsquare

Not applicable
Posts: 1

proc reg and almost zero rsquare

Hello~ guys~

I have a question about R-square using proc reg.

My sample consists of daily data.

I want to run regression by both group and year and to get R square by group.

Data structure is as follows.

group  dept  indpt1  indpt2     date        year

     1                                19950101  1995

     2                                19960205  1996

     3                                19970310  1997

When I run the regression with following code, it generates residual=0 and Rsquare=1 for every observation.

However, it should not be the case since I got positive R-square with part of the sample using another program .

What is the problem of my code and how can I correct this problem?

Any comments are appreciated.


proc sort data=examp; by group year;


proc reg data = examp

noprint tableout edf usscp outest = result_examp;

by group year;

model dpt = indpt1 indpt2;

output out=result_R r=rsqr;


Thank you.

Respected Advisor
Posts: 2,655

Re: proc reg and almost zero rsquare

Posted in reply to saslearner0903

Given your dataset, you are trying to regress a single point.  You have only one record per group.  I would suggest dropping the group variable from the by statement to get the relationship for each year across all groups, and then dropping year variable (and re-inserting group) to look at the relationship for each group across time.  Does that make any sense relative to the objective of your analysis?

Steve Denham

Ask a Question
Discussion stats
  • 1 reply
  • 2 in conversation