The survdiff() from survival package has an argument "rho" that implements
Fleming-Harrington weighted long rank test.
But according to several sources including "survminer" package
Fleming-Harrington weighted log-rank test should have 2 parameters "p" and "q"
to control the weighting for earlier vs later times in the follow-up.
For example, setting rho=1 in survdiff() uses the Peto-Peto modification of
Gehan-Wilcox weights, which I can confirm by setting p=1 & 1=0 in comp() from
survminer package. similarly rho=0 is equivalent to p=0 & q=0
I am interested in putting more weights on survival difference in later
follow-up time. According to comp() from survminer package, that would set p=0
& q=1 for Fleming-Harrington weights.
My question is how I can do the same by setting certain values for "rho" in the
regular survival() function?
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