Method for Linear Regression

Hi Everyone,

Thanks for reading my post.

I am fairly new to data science. I have 3 data sets that contain detail for data categories summarized by year. I would like to do a linear regression with 2 of the variables (numbers). Would I be able to do a linear regression for all 3 data sets after combining them or do I need to focus on each specific year? If I can combine the 3 years, what tools/methods would I use?


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