stata - 为什么 coefplot 不绘制 Stata 中所有级别的交互？

Question

我想将此回归的系数绘制为森林图。

-------------------------------------------------------------------------------
        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(社区提供的命令)生成的森林图仅绘制最后一个系数 (-81)，而不绘制其他系数(-782 和 -1530)。我哪里错了？

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 会自动排除标记为“省略”或“基本水平”的系数——就像您的系数一样。要在图中包含所有系数，您应该指定“省略”和“基线”选项。所以它看起来像这样:

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

此处提供了有关该软件包的更多详细信息:http://repec.sowi.unibe.ch/stata/coefplot/getting-started.html