mrsprep
The mrsprep command restructures survival data and calculates weighted mean expected mortality rates and time-dependent weights so that a marginal relative survival can be directly estimated. After running mrsprep estimation commands that fit (conditional) relative survival models (e.g. stpm3) can be used to estimate marginal relative survival without the need to include covariates that affect expected survival.
You can install mrsprep within Stata using
. ssc install mrsprep