[R-meta] Calculating SMD from posttest only - is this possible?
P. Roberto Bakker
robertob@kker @end|ng |rom gm@||@com
Thu Oct 3 18:54:28 CEST 2019
I am performing a meta-analysis (with 'metafor' R-project) as described by
Becker (1988), and I compute the standardized mean change for a treatment
and control group.
I compute a (standardized) effect size measure for pretest posttest control
group designs, where the characteristic, response, or dependent variable
assessed in the individual studies is a quantitative variable (Morris 2008).
Now, two new articles are published recently with only the posttests.
Question: can SMDs still be calculated with only the posttest (and sd) of
treatment and control groups?
Thank you in advance, Roberto
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