-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On
Behalf Of Alan Wilson via R-sig-meta-analysis
Sent: Thursday, 16 March, 2023 16:04
To: r-sig-meta-analysis at r-project.org
Cc: Alan Wilson
Subject: [R-meta] converting p-values and t-statistics into correlation
coefficients
Hey everyone - I have a student in my meta-analysis class who wanted convert p-
values and t-statistics into correlation coefficients as part of their class
project, but we are struggling to get correlation effect size calculations using
metafor. We have found an online resource through the Campbell Collaboration and
could create an excel spreadsheet for the calculations, but we would prefer to
use metafor for these conversions.
Using this example, escalc(measure="COR", pi=-.07, ni=30), from
https://wviechtb.github.io/metafor/reference/escalc.html, we get the following
error. It is not clear that pi is available in escalc. Any advice how to
overcome this hurdle is appreciated and will be shared with my class. Thanks for
any help. alan
Error in escalc(measure = "COR", pi = -0.07, ni = 30) :
Cannot compute outcomes. Check that all of the required
information is specified via the appropriate arguments.
In addition: Warning message:
Extra argument ('pi') disregarded.
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Alan Wilson - Auburn University
Professor & Graduate Program Officer
Assistant Director for Instruction
School of Fisheries, Aquaculture, and Aquatic Sciences
www.wilsonlab.com<https://www.wilsonlab.com/> - 334.246.1120