I'm trying to find the sample size for an MDES for a regression discontinuity analysis, and I stumbled upon the suite of commands rdpow, rdrobust, and rdsampsi. When attempting to run the most basic form of the rdsampsi command (rdsampsi depvar runvar), Stata responds with the error "option bwcheck() not allowed". Why is Stata displaying this error when I'm not even trying to use the bwcheck() option (nor am I trying to use any option...)? The same exact thing happens when I try to use rdpow (rdpow depvar runvar). The only command that works is rdrobust, but I'm not sure how useful the output here is for my purposes, which is finding a sample size. The Stata Journal article for this package can be read here.

Thanks to anyone who can give me any direction here!