Re: Missing Gender (Categorical values)

From: Alan Xiao Subject: Re: [NMusers] Missing Gender (Categorical values) Date:Wed, 31 Jul 2002 12:20:21 -0400 Nick, You got me. I replaced "think about" with "take into account" but forgot to change "before" to " when". Anyway, my English undoubtedly need be improved and a careful check should be done before the email was sent out. About the imputation, I am just curious about the effect of the imputation on the identifiability of the covariate effect if the effect of the imputed covariate is significant (for example, known from other data). About this topic, you can ask hundreds of similar questions. Here is an example, if the effect of SEX on CL is surely significant, you might get different imputation results and/or parameter estimates when you include SEX into your model, as compared to when you exclude SEX from your model. Or say, the results might be different between imputations using a structural model and using a full model. (I'm not really sure but this should be testable by simulation). If this is true, then it's reasonable to think (in an opposite way) that imputation will influence the identification of the covariates or the significance of the covariates to the model, depending on what kind of imputation method is used. Thank you for the information you listed. Alan.