[R-meta] Effect Sizes From Pretest-Posttest-Control Group Designs and effect sizes from Pretest-Posttest designs

[Yingkai]

Hi Dr. Wolfgang and all,
    I am wondering whether one can combine effect sizes from
pretest-posttest-control Group designs and effect sizes from
pretest-posttest designs(no control group) in a meta-analysis?
I know that one should not combine effect sizes from
pretest-posttest-control Group designs and effect sizes from between-group
designs in a meta-analysis.

Best,
-- 
Yingkai, Associate Professor.
Southwest University, ChongQing, CHINA.

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