Kr20

[Miyuki Takase]

Hello!

I installed KR 20, and run the following code. But an error message appears.

. kr20 cf1-cf4
variable tempTot2 already defined
r(110);

Could you please let me know how to solve this problem? By the way, I use StataNow 18.

Thanks in advance.

[Chinmay Korgaonkar]

*ols

    
 . regress sales_log c.year##i.sector [pweight=mult] if  year< 2017, robust
(sum of wgt is 49,147.85246381)

Linear regression                    Number of obs    =     16,436
                                                F(3, 16432)       =      59.23
                                                Prob > F           =     0.0000
                                                R-squared         =     0.0234
                                                Root MSE          =     1.4645

-------------------------------------------------------------------------------
              |               Robust
Sales_log | Coefficient  std. err.      t    P>|t|     [95% conf. interval]
--------------+----------------------------------------------------------------
         year |   .0116959   .0103872     1.13   0.260    -.0086641    .0320559
    15.industry |   12.56344    36.6089     0.34   0.731    -59.19398    84.32085
              |
industry#c.year |
          15  |   -.006477   .0181834    -0.36   0.722    -.0421184    .0291645
              |
        _cons |  -19.77848   20.91297    -0.95   0.344    -60.77018    21.21322
-------------------------------------------------------------------------------

. margins sector, dydx(year)

Average marginal effects                                Number of obs = 16,436
Model VCE: Robust

Expression: Linear prediction, predict()
dy/dx wrt:  year

------------------------------------------------------------------------------
             |            Delta-method
             |      dy/dx   std. err.      t    P>|t|     [95% conf. interval]
-------------+----------------------------------------------------------------
year         |
   industry |
         14  |   .0116959   .0103872     1.13   0.260    -.0086641    .0320559
         15  |          .  (not estimable)
------------------------------------------------------------------------------

* didregress

. didregress (sales_log export_earnings_log domestic_demand_log) (did) ///
>     [pweight=mult], group(industry) time(year)
(sum of wgt is 66,419.35949187)

Number of groups and treatment time

Time variable: year
Control:       did = 0
Treatment:     did = 1
-----------------------------------
             |   Control  Treatment
-------------+---------------------
Group        |
      industry |         1          1
-------------+---------------------
Time         |
     Minimum |      2011       2017
     Maximum |      2011       2017
-----------------------------------

Difference-in-differences regression                    Number of obs = 23,324
Data type: Repeated cross-sectional

                                                 (Std. err. adjusted for 2 clusters in sector)
----------------------------------------------------------------------------------------------
                             |               Robust
           Sales_log | Coefficient  std. err.      t    P>|t|     [95% conf. interval]
-----------------------------+----------------------------------------------------------------
ATET                         |
                         did |
                   (1 vs 0)  |  -.0309762   .0002102  -147.34   0.004    -.0336474   -.0283049
----------------------------------------------------------------------------------------------
Note: ATET estimate adjusted for covariates, group effects, and time effects.


. estat ptrends

Parallel-trends test (pretreatment time period)
H0: Linear trends are parallel

 F(1, 1) = 36183.37
Prob > F =   0.0033

[Miyuki Takase]

Thank you for your reply.
I am not sure what you meant, but I have solved problem.
If I run the follwoing code (i.e., ssc install kr20) everytime I use kr20 varlist, it worked.
Thanks,

Miyuki