Dear experts:
      I have a question about the inclusion of negative results. SDM can include the negative results (i.e., those that did not survive statistical correction or showed no group differences) in the meta-analysis. I was wondering how the effect size of the study without coordinates was calculated. Or were they included only to enlarge the sample size?
      I would appreciate if anyone could help me with this question. 


Sincerely yours,
Yingxue Gao