Hi,
This is not an S-Plus question but I know that most S-Plus users are
knowledgeable of SAS, so I dare to post it.
I made an analysis involving a time dependent variable both in S-plus and
SAS.
Here is the output for SAS:
CHEMO coef= 0.586384 SE=0.22098 chi-square=7.04154
p-value=0.0080
Result in S-plus:
chemo coef=0.586 se(coef)=0.221 robust se(coef)=0.288 z=2.04
p-value=0.041
It can be noticed that everything is the same except that SAS does not use
the robust SE.
Does this make the time dep. analysis in SAS unreliable? Or maybe there is
an option somewhere to make it use the robust SE?
Thank you,
Please note that my new e-mail address is:
melania.pintilie@uhn.on.ca
Melania Pintilie
OCI/PMH - Biostatistics
610 University Ave.
Toronto, ON, M5G 2M9
Tel: (416) 946-4501 ext. 4886
Fax: (416) 946-2048
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