Hi, I am trying to estimate a conditional frailty survival model, as in Box-Steffensmeier, et al (2007 Political Analysis). I have run them previously in R but would like to implement them in Zelig for post-estimation purposes. Is there a way to do this? While the Cox PH with time-varying covariates is closest to my needs, it does not completely fit the bill. Is this an option in the current Zelig version? Thanks, B Peterson