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References
1.
1. SAS Language Guide , Release 6.03 edition. Cary, NC : SAS Institute, Inc.
1988 .
2.
2.
Fleiss JL
: Statistical Methods for Rates and Proportions , 2nd ed. New York : Wiley and Sons
1981 , pp. 143 –146 .
3.
3.
Rosner B
: Fundamentals of Biostatistics , 3rd ed. Boston : PWS-Kent
1990 , pp. 357 –360 .