Fixed IPCW alpha bug
The value of alpha from IPCWEstimator was not being passed into the Cox fitter, so it was always using 95% confidence intervals. Now alpha is being passed in, so confidence intervals can be customised as intended.
The value of alpha from IPCWEstimator was not being passed into the Cox fitter, so it was always using 95% confidence intervals. Now alpha is being passed in, so confidence intervals can be customised as intended.