如何在stata estout中引用滞后交互系数? (错误 "coefficient not found")

How to reference lagged interaction coefficient in stata estout? (error "coefficient not found")

我有一个(也许)关于 Stata 中 estout 的简单问题:

我有一个面板数据集,想通过estout导出回归表,但只保留一些系数。我遇到的问题是我不明白如何参考 1) 滞后和 2) 相互作用的系数。对于每种情况,esttab 都可以正常工作,但是当我同时尝试这两种情况时,系数“未找到”(Stata 错误项)。

示例:

clear 
ssc install estout

input float(code year var1 var2 var3)
1 2000 1 2 3 
1 2001 45 5555 8
1 2002 3 3 3
2 2000 11 8 9 
2 2001 2 1 12
2 2002 3 4 11111
3 2000 4 77 1
3 2001 3 99 3
3 2002 111 9 20
end

xtset code year
eststo: xtpcse var1 l.c.var2##l.c.var3
esttab using example.rtf, keep(l.c.var2#l.c.var3) replace

没有交互中的滞后变量,keep() 命令中的“c.var2#c.var3”工作正常。如果没有交互,keep() 命令中的“l.var2”也能正常工作。结合起来,我收到一个错误...

这个问题看起来很简单,但我就是想不通。

观察回归输出中出现的系数名称:

eststo: xtpcse var1 l.c.var2##l.c.var3

Linear regression, correlated panels corrected standard errors (PCSEs)

Group variable:   code                          Number of obs     =          6
Time variable:    year                          Number of groups  =          3
Panels:           correlated (balanced)         Obs per group:
Autocorrelation:  no autocorrelation                          min =          2
                                                              avg =          2
                                                              max =          2
Estimated covariances      =         6          R-squared         =     0.2801
Estimated autocorrelations =         0          Wald chi2(3)      =      29.28
Estimated coefficients     =         4          Prob > chi2       =     0.0000

---------------------------------------------------------------------------------
                |           Panel-corrected
           var1 |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
----------------+----------------------------------------------------------------
           var2 |
            L1. |   .3047307   .7251617     0.42   0.674     -1.11656    1.726022
                |
           var3 |
            L1. |  -2.842736   1.995148    -1.42   0.154    -6.753154    1.067682
                |
cL.var2#cL.var3 |  -.0384245   .0907775    -0.42   0.672    -.2163452    .1394962
                |
          _cons |   40.83134   12.87304     3.17   0.002     15.60066    66.06203
---------------------------------------------------------------------------------

接着 esttab using example.rtf, keep(cL.var2#cL.var3) replace 对我有用。