Add the ability in PROC PHREG to fit relative survival models.
Some references include:Dickman, P. et. al., (2004) "Regression Models for Relative Survival" Statistics in Medicine, 23:51-64. Ederer et. al. (1961) "The Relative Survival Rate: A Statistical Methodology" National Cancer Institute Monograph, 6: 101-121.
Esteve J, Benhamou E, Croasdale M, Raymond L. (1990) "Relative Survival and the Estimation of Net survival: Elements for Further Discussion", Statistics in Medicine 9(5), 529-538.
Pohar Perme M, Stare J, Esteve J. (2012) "On estimation in relative survival." Biometrics 68:113–120.
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