Dear statalisters,
I am performing an analysis where I need to calculate the percent attenuation between two Confidence Intervals (of OR or RR or HR or beta).
Essentially I have a CI for an unadjusted model and a CI for an adjusted model, and I want to compute the attenuation percentage between them, due to the covariable added in the adjusted model.
In the literature the parameter is computed with the following formula.
Now I also want to compute the 95%CI for percent_att. Previous research states: "(...) we calculated a 95%CI around it using a bias corrected accelerated (BCa) bootstrap method with 2000 resampling."
References are:
Pubmed uid: 21364974
Other ref: SAS Institute Inc. (2000) SAS/STAT user’s guide, version 8. Cary (North Carolina): SAS Institute Inc.
However, I do not know how to this in SAS. I could program it however in STATA or R.
Thank you for your kind reply
Best
Dusan
I am performing an analysis where I need to calculate the percent attenuation between two Confidence Intervals (of OR or RR or HR or beta).
Essentially I have a CI for an unadjusted model and a CI for an adjusted model, and I want to compute the attenuation percentage between them, due to the covariable added in the adjusted model.
In the literature the parameter is computed with the following formula.
Code:
percent_att=100 * (Beta_unadj - Beta_adj)/Beta_unadj
References are:
Pubmed uid: 21364974
Other ref: SAS Institute Inc. (2000) SAS/STAT user’s guide, version 8. Cary (North Carolina): SAS Institute Inc.
However, I do not know how to this in SAS. I could program it however in STATA or R.
Thank you for your kind reply
Best
Dusan
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