Estimate inverse probability weights CRAN Task View: Survival (http://CRAN.R-project.org/view=Survival) Estimate inverse probability weights. These are typically used to perform inverse probability weighting (IPW) to fit a marginal structural model (MSM), to estimate causal effects from observational data. Both data from point treatment situations and longitudinal studies can be used. Software Depends: R (>= 2.0.0), boot, geepack, MASS, nlme, nnet, survey, survival Willem M. van der Wal <w.m.vd.wal@umcutrecht.nl> Willem M. van der Wal <w.m.vd.wal@umcutrecht.nl> GPL (>= 2) 2011-09-11 application/tgz http://CRAN.R-project.org/package=ipw