Using "IF" command with xtreg fixed effects

[Murphy Shane]

Hi,

I wanted to restrict by regression using the "if" command in a fixed effect regression with xtreg, fe on it. Can anyone suggest?

Thanks in advance.

[Carlo Lazzaro]

Murphy:
yes, of course.
Here you are:

. use "https://www.stata-press.com/data/r16/nlswork.dta"
(National Longitudinal Survey.  Young Women 14-26 years of age in 1968)

. xtreg ln_wage age if idcode<=4, fe

Fixed-effects (within) regression               Number of obs     =         50
Group variable: idcode                          Number of groups  =          4

R-sq:                                           Obs per group:
     within  = 0.0912                                         min =         11
     between = 0.0122                                         avg =       12.5
     overall = 0.0412                                         max =         15

                                                F(1,45)           =       4.52
corr(u_i, Xb)  = -0.1407                        Prob > F          =     0.0391

------------------------------------------------------------------------------
     ln_wage |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
         age |   .0157496   .0074109     2.13   0.039     .0008233    .0306758
       _cons |   1.345101   .2231985     6.03   0.000     .8955561    1.794646
-------------+----------------------------------------------------------------
     sigma_u |  .23522653
     sigma_e |  .32804009
         rho |  .33957838   (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(3, 45) = 6.62                       Prob > F = 0.0008

.

[Murphy Shane]

Thanks so much for the quick help. I had another question, I didn't get any response unfortunately. Should I post it again?

[Nick Cox]

https://www.statalist.org/forums/help#adviceextras #1 explains about reposts (please don't). Try to improve the question by making it clearer but in the same thread. For example, you may need to edit a copy of the post to put "more than" in key places.