为什么coefplot没有在Stata中描绘出所有层次的互动？

Question

我想把这个回归的系数画成一个森林图。

-------------------------------------------------------------------------------
        price | Coefficient  Std. err.      t    P>|t|     [95% conf. interval]
--------------+----------------------------------------------------------------
foreign#rep78 |
  Domestic#1  |   -781.769   1013.428    -0.77   0.443    -2805.724    1242.186
   Foreign#0  |  -1529.739   1771.487    -0.86   0.391    -5067.642    2008.164
   Foreign#1  |  -81.34985   848.0347    -0.10   0.924    -1774.992    1612.292
              |
        _cons |   6358.405   485.1416    13.11   0.000     5389.511      7327.3
-------------------------------------------------------------------------------

由coefplot (社区贡献命令)产生的林地只绘制最后的系数(-81)，而不是其他系数(-782和-1530)。我哪里出问题了？

sysuse auto, clear

recode rep78 (1/3=0) (4/5=1)
    
reg price i.foreign#i.rep78

* Only plots last coefficient (-81)
coefplot, keep(*.foreign#*.rep78) mlabel

* Doesn't work either
coefplot, keep(0.foreign#1.rep78 1.foreign#0.rep78 1.foreign#1.rep78) mlabel

Answer 1

coefplot自动排除被标记为“省略”或“基本水平”的系数--就像你的系数一样。要在图中包含所有系数，您应该指定“省略”和“基本层”选项。所以它看起来像这样的东西：

sysuse auto, clear
recode rep78 (1/3=0) (4/5=1)
reg price i.foreign#i.rep78
coefplot, omitted baselevels mlabel

有关该包的更多详细信息可在这里获得：http://repec.sowi.unibe.ch/stata/coefplot/getting-started.html