This is a minor problem with the print method for "survdiff" objects. It
acts like it computes the p-value with
1 - pchisq( chisq, df)
instead of
pchisq( chisq, df, lower.tail = FALSE)
The former will give zero when the latter gives a number less than about
10^-16.
Most people would accept
This is not an R question.
Your question indicates that you really need to learn some statistics.
To answer the very last part:
> pchisq(430,3,lower=FALSE)
[1] 7.020486e-93
And if that is not 0 to all intents and purposes, then God help us all.
cheers,
Rolf Turner
On 19/05/17 12:48, Anne K
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