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Yes, it was the problem. I solved it by excluding one dummy in each category since I basically included all possibilities in a category, thanks!

Hello, I am doing my thesis and I need some help because I am getting the "Near singular matrix" error once I try to run the model. I am studying the impact of a fund on its portfolio of companies' performance, using undated panel data. Undated because I am using 1, 2, 3 (...) years after ...