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  • F-Test in Panel data Fixed effects regression


    Hi,

    I wanted to ask about my fixed effects panel data reg model. If F-test comes like this, is it because of limited within-variation in my model.

    my reg code is: xtreg depvar c.indvar#c.var1 indvar var1 controls i.year, fe cluster(code)



    Code:
    Fixed-effects (within) regression               Number of obs     =        408
    Group variable: code                            Number of groups  =         35
    
    R-sq:                                           Obs per group:
         within  = 0.8481                                         min =          1
         between = 0.0517                                         avg =       11.7
         overall = 0.0836                                         max =         27
    
                                                    F(33,34)          =          .
    corr(u_i, Xb)  = -0.0895                        Prob > F          =          .
    
                                                  (Std. Err. adjusted for 35 clusters in code)
    ------------------------------------------------------------------------------------------
                             |               Robust
                    lnvaagri |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
    -------------------------+----------------------------------------------------------------
             c.lntt#c.lnTop1 |  -.1851019   .1041385    -1.78   0.084    -.3967368     .026533
                             |
      GDPgrowthannualNYGDPMK |   .0132982   .0130873     1.02   0.317    -.0132983    .0398947
    MilitaryexpenditureofGDP |  -.0631535   .0454807    -1.39   0.174    -.1555814    .0292743
                         FDI |   .0088222   .0093383     0.94   0.351    -.0101555    .0277998
    Populationages1564oftota |  -.0745616   .0438588    -1.70   0.098    -.1636933    .0145702
    Manufacturingvalueadde~u |   .0015056   .0049307     0.31   0.762    -.0085147    .0115259
    Armedforcespersonnelof~t |   .0327905   .1257275     0.26   0.796    -.2227185    .2882996
                        lntt |  -.2932767   .1676205    -1.75   0.089    -.6339225    .0473692
                      lnTop1 |   .6766543   .5728055     1.18   0.246    -.4874265    1.840735
                             |
                        year |
                       1991  |   .3424234   .2553916     1.34   0.189    -.1765948    .8614415
                       1992  |   .1884407   .2802448     0.67   0.506    -.3810852    .7579666
                       1994  |   .6193001   .2852213     2.17   0.037     .0396606     1.19894
                       1995  |   .8311788   .3216836     2.58   0.014     .1774391    1.484919
                       1996  |   .9796368   .3212456     3.05   0.004     .3267872    1.632486
                       1997  |    1.08963   .3303083     3.30   0.002     .4183626    1.760897
                       1998  |   1.401739   .3404516     4.12   0.000     .7098576     2.09362
                       1999  |   1.443863    .368264     3.92   0.000     .6954607    2.192266
                       2000  |   1.401343   .3474318     4.03   0.000      .695277     2.10741
                       2001  |   1.505188   .3405816     4.42   0.000     .8130427    2.197333
                       2002  |    1.59113   .3811383     4.17   0.000     .8165636    2.365696
                       2003  |   1.670692   .3930908     4.25   0.000     .8718349    2.469548
                       2004  |   1.689771   .4062681     4.16   0.000     .8641353    2.515407
                       2005  |   1.855223   .4249482     4.37   0.000     .9916247    2.718822
                       2006  |   2.069526   .4372615     4.73   0.000     1.180904    2.958148
                       2007  |   2.146029   .4226644     5.08   0.000     1.287072    3.004986
                       2008  |   2.359869   .4164261     5.67   0.000     1.513589    3.206148
                       2009  |   2.565442   .4224304     6.07   0.000      1.70696    3.423924
                       2010  |   2.671038   .4334167     6.16   0.000     1.790229    3.551847
                       2011  |   2.755191   .4598048     5.99   0.000     1.820755    3.689627
                       2012  |   2.917586   .4493767     6.49   0.000     2.004343     3.83083
                       2013  |   2.972358     .46013     6.46   0.000     2.037262    3.907455
                       2014  |    3.06354   .4511266     6.79   0.000      2.14674    3.980339
                       2015  |   3.079553   .4645105     6.63   0.000     2.135554    4.023552
                       2016  |   3.217813   .4809232     6.69   0.000      2.24046    4.195167
                       2017  |    3.47523   .5299741     6.56   0.000     2.398193    4.552267
                             |
                       _cons |   16.29664   2.597591     6.27   0.000      11.0177    21.57558
    -------------------------+----------------------------------------------------------------
                     sigma_u |  3.3424041
                     sigma_e |  .37255938
                         rho |  .98772814   (fraction of variance due to u_i)
    ------------------------------------------------------------------------------------------

  • #2
    Abdullah:
    see -help j_robustsingular-.
    Kind regards,
    Carlo
    (Stata 19.0)

    Comment


    • #3
      mant thanks. Really appreciate that !

      Comment

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