| logitp {metap} | R Documentation |
Combine p values using logit method
logitp(p) ## S3 method for class 'logitp' print(x, ...)
p |
A vector of p values |
x |
An object of class ‘ |
... |
Other arguments to be passed through |
Defined as
t = - sum log(p / (1 - p)) / C
where
C = sqrt((k pi^2 (5 k + 2)) / (3(5 k + 4)))
and k is the number of studies.
The values of p should be such that 0<p<1. A warning is issued if this means that studies are omitted and an error results if as a result fewer than two studies remain.
The plot method for class ‘metap’ calls schweder on the valid
p-values
An object of class ‘logitp’ and
‘metap’, a list with entries
t |
Value of Student's t |
df |
Associated degrees of freedom |
p |
Associated p-value |
validp |
The input vector with illegal values removed |
Michael Dewey
Becker, B J. Combining significance levels. In Cooper, H and Hedges, L V, editors A handbook of research synthesis, chapter 15, pages 215–230. Russell Sage, New York, 1994.
See also schweder
data(teachexpect)
logitp(teachexpect) # t = 2.763, df = 99, p = 0.0034, from Becker
data(beckerp)
logitp(beckerp) # t = 1.62, df = 29, NS, from Becker
data(validity)
logitp(validity) # t = 9.521, df = 104, p = 3.89 * 10^{-16}