Regression analysis ：bootstrap x

[Teresa Wang]

Hi everyone, I'm having this problem with my classmates and can't find a solution! When I use bootstrap to test the significance of the coefficients of my regression model, I get little red x because I have dummy variables （UWrepu , Adrepu , year, industry）in my control variables? (I find that when I remove the time and industry fixed effects it's not a red “x” anymore)
Please help me to answer! Thank you!

code：bootstrap, reps(1000): reg Underprice SSEr size roa lev Issuerate IPOduration UWrepu Adrepu rd IH F M i.year i.ind,noheader

[Clyde Schechter]

More or less duplicate post. See https://www.statalist.org/forums/for...ootstrap-red-x.