Dear All,

I have two simple yet complicated question.

I run my regressions on survey data using the OLS model in which productivity is my dependent and gender and age are my independent and explanatory variables

In the first run I do not add regional dummies (provinces) and in the second regression I add the regional dummies.

I find that my independent variable is NOT significant when I exclude regional dummies and in the second case I add regional dummies and find that it IS SIGNIFICANT. What does this mean and how do I interpret this


In another case I find that my other explanatory variable in the "no regional dummy model" is significant at the 90% confidence level and in the "regional dummy model" at the 95% confidence level

Thanks.