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  1. J

    Random Effects probit model - industry and time dummies

    Hi everyone, I'm runnig this model in STATA, in a panel database of firms. As the dependent variable is a binary one, I use: xtprobit Y x1 x2 x3, re. I have these questions: 1) Should I also include industry and time fixed effects? (i.e. i.industry, i.year) 2) When I try to include...
  2. J

    Inverted U-shape and moderation

    Good afternoon, I'm working with panel data, a fixed effects model, and I'm testing an inverted U-shape between my main independent variable (X) and the dependent one (Y). Thus, I have included X (which is positive and significant) and X^2 (which is negative and significant) in the regression...