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I'm using multiple linear regression to identify what affects discounts, customers receive. Therefore, I interviewed salesmen and collected data based on their assumptions (e.g. weather data, pricees in other stores etc.).

Now I have 25 independent variables and 30000 observations. Is it neccessary to select the best variables out of the 25 variables?

I think that I just could perform the regression on all variables to see whether there is support for the assumptions from the interviews. If variables are not significant I would drop them and create a new regression model on the remaing ones.

Thanks!

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  • $\begingroup$ You could since you have the data for it, however it would be better if you could remove some beforehand which you suspect are non-informative. $\endgroup$ – user2974951 Dec 5 '18 at 7:30

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