Kåre Edvardsen wrote:
My apologies for asking slightly about SPSS in addition to R...
Could not find an exact answer in the archives on whether R and SPSS may
give different p-vals when output for coeffs and conf-intervals are the
same.
Amyway, a colleague and I are doing a very simple coxreg analyses and
get the same results for the coefficient and confidence interval,
exp(coef) exp(-coef) lower .95 upper .95
age_at_entry 1.02 0.98 1.01 1.03
but in R we get p = 0.00011, and SPSS gives p < 0.0001
This might happen due to numerical differences in the algorithms for
computing on the distributions. Both p values are not that different ...
For I would not worry if the difference is that small and practically
identical.
Uwe Ligges
Should we worry about this difference in p-value or do R and SPSS
sometime differ?
All the best,
Kare
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