Problems with the BTYD walk-through fixed

If you're going through the Buy 'Til You Die package's walk-through, you are bound to get stuck in a couple of places. Here are fixes to some of those problems.

Page 5
Warning message:
In cbind(f, r, T) : number of rows of result is not a multiple of vector length (arg 2)

This error occurs because the walk through specifies tot.cbt as tot.cbt = dc.CreateFreqCBT(elog). This is incorrect and should be tot.cbt = dc.CreateFreqCBT(elog.cal). After making that change, the error is fixed.

Page 6
Error: could not find function "pnbd.PlotDropoutHeterogeneity"

pnbd.PlotDropoutHeterogeneity(params) doesn't work because the function name has changed. Replace it with pnbd.PlotDropoutRateHeterogeneity(params) and it works fine.

Page 8
Error in pnbd.PAlive(params, x, t.x, T.cal) : could not find function "hyperg_2F1"

If you haven't loaded the package "gsl", the function pnbd.ConditionalExpectedTransactions will throw an error. It's easily fixed by loading the gsl library.