Add error messages to ypinterim.default to help
users detect common errors easily.
Fixing errors when critvalue is supplied in the
ypinterim function.
the argument name of spenfun in the
ypinterim function is changed to
spendfun.
When the alpha spent is less than 1E-4, the boundaries of that look and the corresponding nominal p-values are now obtained using a (conditional) normal distribution.
When the value of the observed statistic is greater than
qnorm(1 - 1E-4/2), the nominal p-values are now obtained
using a normal distribution.
The default value for repnum is set to 1E4.
The the results from print and summary
of the ypinterim class now show the nominal p-values for
the boundaries.
Update the references on the help documents and the DESCRIPTION file as they are now available online.
Add new examples to the ypinterim help documents in
order to show how to utilize the argument critvalue in the
function clearly.
Error fixed in the example data: the virtual_data
has also been changed to have only one group
vector.