dear all，

I am an OHDSI CDM user and a researcher, but now I have a problem. For example, I have five CDM database, each has 10000 people. But because of some reason, I can only calculate the corresponding parameters of each database separately, I have no right to put 50000 people of these five databases together to calculate the parameters of the total. So my problem is in this situation if I want the statistics results of the 50000 people when I can only calculate the separate results of five databases, can I do that? such as Analysis of Variance （ANOVA）

Best regards

thank you very much！