Hello!
I'm calculating the relative excess risk due to interaction (RERI) using Cox's proportional hazards model by using the formula according to Li et al.: RERI(HR) = HR(1,1) - HR(1,0) - HR(0,1) + 1. This generates a number indicating whether or not there is an additive interaction. My question is how can I retrieve a P-value and a 95 % confidence interval for this excess risk using the SAS software?
Thank you very much for your help!
SokolowLyon
You need to use an ESTIMATE statement to get your custom estimates.
If you're not familiar with ESTIMATE or CONTRAST statements, I suggest reading this paper first:
https://support.sas.com/resources/papers/proceedings11/351-2011.pdf
@SokolowLyon wrote:
Hello!
I'm calculating the relative excess risk due to interaction (RERI) using Cox's proportional hazards model by using the formula according to Li et al.: RERI(HR) = HR(1,1) - HR(1,0) - HR(0,1) + 1. This generates a number indicating whether or not there is an additive interaction. My question is how can I retrieve a P-value and a 95 % confidence interval for this excess risk using the SAS software?
Thank you very much for your help!
SokolowLyon
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