Comparing data sets (raw vs. not raw data)

I have multiple data sets that I am trying to run regression analyses on. I have the raw data for some of the data sets. For others, I only have the mean, standard deviation, and number of samples. What is the best way to compare these data sets?


Ambassador to the humans
How would you run regression when you only have the summaries? Maybe you could provide a concrete example of what you have and what you want to do.
I think I misspoke. If I wanted to compare the data sets in general, whether that's with t-tests or regressions (which I can't do) or other methods, how would you compare these data sets if I only have raw data for some of them?