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2012 Jan 10
1
Lapack routine dgesv: system is exactly singular
Hi
I have a problem with this error, I have searched the archives and found
previous discussion about this, can I cannot understand how the explanations
apply to what I am trying to do.
I am trying to do Log_rank Survival analysis, I have included tables and str
command, is it a factor/integer problem? If so how do I correct this, as all
my attempt to recode the data have failed.
> survdiff(Surv(f2$days.alive , f2$censored)~group, data=f2)
Error in drop(.Call("La_dgesv", a, as.matrix(b), t...