calculating wald confidence intervals? please help

[katiexyz]

http://i60.tinypic.com/2coppiw.png

Hiya, not sure how to calculate a confidence interval, particularly the standard error

My teacher said it's "exp(B1 + B4 +/- 1.96* sqrt(se(B1) + se(B4) + 2cov(B1,B4) )"

where B1 is the factor and B4 is the interaction term (estimates).

xxx

[katiexyz]

obviously i think she's wrong! otherwise i wouldn't be on here... xx

[Reeza]

You haven't provided enough info. What proc are you using, what code, options?

If its survival analysis and you need WALD CI for hazard ratio you can use the CL=WARD option on the hazard ratio statement.