[R-meta] Question Re: CI in metafor

Caitlin Porter cporter2 @ending from centr@l@uh@edu
Tue May 29 22:16:41 CEST 2018

 Recently, I have been using the metafor program to run analyses for a
meta-analysis based on the Hunter-Schmidt approach. I have been
double-checking my own calculations with the program, and I found that my
calculations of confidence intervals do not align with the calculations
provided by metafor.

I am using the SD of the corrected Rs as a basis for my CIs (square root of
the variance of the corrected Rs/square root of k), as noted in Schmidt and
Hunter (2013, p. 154, pp. 420-421). However, the confidence intervals that
appear in the metafor output appear to be based upon the sampling error
variance (the square root of Ave(ve)/square root of k).

1) Is there was a reason that the CIs in metafor are based upon this value
as opposed to the one suggested by HS?
2) Is one approach preferred over the other?

Thank you in advance for your insights on this matter!

Caitlin M. Porter, Ph.D.

Assistant Professor
Industrial and Organizational Psychology
Department of Psychology
University of Houston
3625 Cullen Blvd.
Houston, TX 77204

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