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[no subject]
Fernando
On Wed, Nov 9, 2011 at 4:42 AM, Nick Cox <[email protected]> wrote:
> Not so:
>
> webuse nlswork
> xtset idcode
> generate age2 = age^2
> xtreg ln_w grade age*
>
> <all work fine>
>
> . gen badvar = string(_n)
>
> . xtreg ln_w grade age* badvar
> no observations
> r(2000);
>
> Nick
> [email protected]
>
> Vikram Finavker
>
> Have you checked the 3 variables which you are adding. If they are
> string then stata will give you these message.
>
> On 9 Nov 2011, at 03:30 AM, donsaane <[email protected]> wrote:
>
>> I am running a fixed effect model. I have to run this model with 16
>> variables but I can only run with 13 variables because the R-squared is
>> 0.984. When I add the 3 others variables, stata said: 'insufficient
>> obervations' although these variables have many observations. Is there a
>> problem with that? I f yes how can I solve that.
>> PS: I'm working on a balanced panel
>> Here the example of my output
>>
>>
>> xtreg emploi c30a j30f c30b d30a d30b e30 g30a h30 i30 j30a j30b, fe
>> vce(robust)
>>
>> Fixed-effects (within) regression Number of obs =
>> 82
>> Group variable: panelid Number of groups =
>> 70
>>
>> R-sq: within = 0.9874 Obs per group: min =
>> 1
>> between = 0.0672 avg =
>> 1.2
>> overall = 0.0605 max =
>> 2
>>
>> F(11,69) =
>> 118.55
>> corr(u_i, Xb) = -0.9701 Prob > F =
>> 0.0000
>>
>> (Std. Err. adjusted for 70 clusters in
>> panelid)
>> ----------------------------------------------------------------------------
>> --
>> | Robust
>> emploi | Coef. Std. Err. t P>|t| [95% Conf.
>> Interval]
>> -------------+--------------------------------------------------------------
>> --
>> c30a | .9143767 .059555 15.35 0.000 .7955678
>> 1.033186
>> j30f | -.47526 .030562 -15.55 0.000 -.5362296
>> -.4142904
>> c30b | .0024208 .0192561 0.13 0.900 -.035994
>> .0408356
>> d30a | -.2705821 .0331653 -8.16 0.000 -.3367451
>> -.2044191
>> d30b | -.5215098 .0365427 -14.27 0.000 -.5944105
>> -.4486091
>> e30 | -.4530234 .0565547 -8.01 0.000 -.565847
>> -.3401997
>> g30a | .5852609 .0403684 14.50 0.000 .5047281
>> .6657937
>> h30 | -.1785489 .0161245 -11.07 0.000 -.2107165
>> -.1463814
>> i30 | -.0622 .0232747 -2.67 0.009 -.1086317
>> -.0157683
>> j30a | -.6889813 .0697342 -9.88 0.000 -.8280972
>> -.5498655
>> j30b | .4019738 .0364463 11.03 0.000 .3292655
>> .4746821
>> _cons | 2.07585 .2529012 8.21 0.000 1.571326
>> 2.580374
>> -------------+--------------------------------------------------------------
>> --
>> sigma_u | 1.915378
>> sigma_e | .13146307
>> rho | .99531125 (fraction of variance due to u_i)
>> ----------------------------------------------------------------------------
>> --
>>
>> . xtreg emploi c30a j30f c30b d30a d30b e30 g30a h30 i30 j30a j30b j30c, fe
>> vce(robust)
>> insufficient observations
>> r(2001);
>>
>
>
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