Hey all. I thought I would ask a general question regarding some data that I am having trouble with. Basically I have a sample of data collected from a meta-analysis. So I have 30 studies. However, only 29 studies report the mean age. I was wondering if someone knows how to get the final data point based on statistical jack knifing (suggestion) or extrapolation using regression analysis. Basically how do I analyze my data to give me one more data point. I understand that adding a new point will induce more error in the overall value but thats Ok. IS this possible!!! Please help... I am about to get published... And this is the last part.