I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's correlation as effect size. However, many of the studies do not report correlations, but rather path analysis or SEM coefficients or regression coefficients. Is there a way to include those studies anyway (like, say, transform those into correlations???)

I am sorry, if it is a stupid question. I have managed to confuse myself quite completely in the past few weeks...