By default splits the \(p\)-values at 0.5 with those below
counting as positive and those above counting as
negative.
However setting alpha
allows for a different choice of cut-off
and also by specifying two different values
for a neutral zone.
If either value of alpha is greater than unity
it is assumed to be a percentage.
The values of \(p\) should be such that
\(0\le{}p\le{}1\) and a warning is issued if this
is not true
An
error occurs if possibly as a result of deletion
fewer than two studies remain.
The plot method for class ‘metap’
calls schweder on the valid
\(p\)-values