Sorry for the lack of clarity. I don't have this all figured out so it is even hard to ask the right questions. For a metaanalysis -- in examining different articles some articles report pre-test posttest data, others report their overall data in different ways. For example, in one study all that seems to be reported in % data. I need to convert that % data into a standardized score. Is it possible? If it is possible, what is the minimal data I need to convert the score and how might that be done.