REFERENCES
- Freund , R. J. and Littell , R. C. 1986 . SAS System for Regression Cary , NC : SAS Institute. .
- Lewis , B. R. and Ford , R. K. 1987 . Basic Statistics Using SAS St. Paul , MN : West Publishing. .
- SAS Institute, Inc . 1989 . Master Index to SUGI Proceedings Cary , NC : Author. .
- Searle , S. R. 1989 . “Statistical Computing Packages: Some Words of Caution,” . The American Statistician , 43 : 189 – 190 .