Re: Imputation of missing sex covariate
From:"Lewis B. Sheiner"
Subject:Re: [NMusers] Imputation of missing sex covariate
Date:Thu, 22 Aug 2002 09:13:49 -0700
That's fine, but single imputaiton is not a good idea, so I would modify
as indicated below ...
Use multiple imputation:
Introduce BSA or BSA and SCR and calculate the anti-logit, p =
probability of being male.
Then for each of the 5-10 imputations, for each indivdual with missing sex
1. Draw a uniform random number r between 0 and 1, and assign sex = male
if r<p.
2. Analyze now-complete data
_/ _/ _/_/ _/_/_/ _/_/_/ Lewis B Sheiner, MD (lewis@c255.ucsf.edu)
_/ _/ _/ _/ _/ Professor: Lab. Med., Biophmct. Sci.
_/ _/ _/ _/_/_/ _/_/ Mail: Box 0626, UCSF, SF,CA,94143
_/ _/ _/ _/ _/ Courier: Rm C255, 521 Parnassus,SF,CA,94122
_/_/ _/_/ _/_/_/ _/ 415-476-1965 (v), 415-476-2796 (fax)