i used OLS before i've include control variables i found negative association between X and Y after including the Size i found positive association but the correlation is negative. why this happen ?
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It’s a bit difficult to determine what happened, but it sounds like Simpson’s paradox. – Dave Dec 25 '20 at 15:26
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Does this answer your question? [Positive correlation and negative regressor coefficient sign](https://stats.stackexchange.com/questions/34151/positive-correlation-and-negative-regressor-coefficient-sign). That seems to be the same question, with the signs of the correlations and regression coefficients switched. – EdM Dec 25 '20 at 17:59