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katiexyz
Calcite | Level 5

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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

2 REPLIES 2
katiexyz
Calcite | Level 5

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

Reeza
Super User

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.

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