Example data for iptw function (long version, more than two treatments).
These data are simulated to demonstrate the iptw function in the "long" data format.
data(lindner)
A list with a covariate matrix and outcomes.
Time-invariant covariates are gender and age. The time-varying covariate is use. The reatment indicator is given by tx. An individual level identifier is given in ID, and the time period is time.
Vector of post-treatment outcomes.
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