Hi everyone,

Stata does not display a F value for the following command. Unfortunately, I cannot display the output as I am using confidential data, but I can share the information below.

Does anyone know what I could do about this ? The corresponding OLS and random effect regression does yield an F-test for overall significance and it is ok. Do I have to worry about this then?

xtreg invbv i.exbo_d i.exbo_d#c.epa_pos_scale i.exbo_d#c.epa_neg_scale i.exbo_d#c.opa_pos_scale i.exbo_d#c.opa_neg_scale i.brsect_d fyear_c empt_c, fe cluster(idnum)

Fixed-effects (within) regression Number of obs = 8,028
Group variable: idnum Number of groups = 2,816

F(20,2815) = .
Prob > F = .

Many thanks in advance for any helpful comment!