[R] cox.zph

From: singyee ling <singyee.ling_at_googlemail.com>
Date: Thu 26 Jan 2006 - 06:15:10 EST


Dear R-users,

I am sorry if this is obvious. I am testing the proportional hazard assumptions using cox.zph. If i am not wrong, a g(t) function must be assumed. Four possibilities available in R are "km","identity" and "rank". may i know what functions of time are these transformation assuming?

Thanks a lot in advance for your wisdom.

kind regards,
sing yee ling

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