[cem] Fwd: cem and multiply imputed data sets from Amelia

Hi, I asked this question about six weeks ago, but had not heard anything back. Any help would be greatly appreciated. Thanks, Bill ---------- Forwarded message ---------- From: William Mabe <billmabe(a)gmail.com> Date: Wed, Apr 25, 2012 at 10:01 PM Subject: cem and multiply imputed data sets from Amelia To: cem(a)lists.gking.harvard.edu I am using cem to match treatment and control group members from 5 multiply imputed datasets from Amelia. I've encountered two types of problems. First, when I run a logit model after calling cem on the multiply imputed datasets: LOG_CA_SCORE + LOG_CM_SCORE, data = imputed, model = "logit") I get the following warning messages, one for each multiply imputed dataset: Warning messages: 1: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm! 2: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm! 3: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm! 4: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm! 5: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm! My dependent variable had no missing cases, so the values for it were not imputed for any observations, and I have checked that the values of it are either 0 or 1. Any ideas why I am getting this warning? I've noticed from searching online that this warning arises when weights are included in a binomial glm model, so I wonder if it might have something to do with how cem is weighting the control observations. (2) The second issue relates to displaying the output of the model. When I type: I get: Logistic model on CEM matched data: SATT point estimate: 1.509872 (p.value=0.001640) 95% conf. interval: [0.570028, 2.449717] which is fine, but when I type: I get: Treatment effect estimation for data: NULL Logistic model estimated on matched data only Coefficients: Error in symnum(pv, corr = FALSE, na = FALSE, cutpoints = c(0, 0.001, : 'x' must be between 0 and 1 Any idea why I'm getting this error? Thanks for any help you can provide, Bill