Question about the command fuzzydid

[Raymond Zhang]

Dear all, When I run the codes of fuzzydid help file,but I get an error.I don't know why.

     use turnout_dailies_1868-1928.dta,clear

   gen G1872=(fd_numdailies>0)-(fd_numdailies<0) if  (year==1872)&fd_numdailies!=.&sample==1

   sort cnty90 year

   replace G1872=G1872[_n+1] if cnty90==cnty90[_n+1]&year==1868

   fuzzydid pres_turnout G1872 year numdailies, did tc cic newcateg(0 1 2 45)   breps(200) cluster(cnty90)

  When only one G variable is specified by the user, that variable must either be equal to 0, 1, or be 
  missing. See section 4.2 of the paper in the Stata journal for more details on how to create the G 
  variables.

Best
Raymond

[Justin Niakamal]

I encountered this issue before. If you look at

. tab G1872

      G1872 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |         54        3.65        3.65
          0 |      1,234       83.49       87.14
          1 |        190       12.86      100.00
------------+-----------------------------------
      Total |      1,478      100.00

You can see that there is a -1 value in G1872 (the G variable). In the case of the example in the help file you can get fuzzydid (from Stata Journal) to work using

. fuzzydid pres_turnout G1872 year numdailies if G1872 != -1, did tc cic newcateg(0 1 2 45) breps(200) cluster(cnty9
> 0)
(running estim_wrapper on estimation sample)

Bootstrap replications (200)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
..................................................    50
..................................................   100
..................................................   150
..................................................   200

Estimator(s) of the local average treatment effect with bootstrapped standard errors.  Cluster variable: cnty90.
Number of observations:  1424 .

             |      LATE    Std_Err          t    p_value   lower_ic   upper_ic
-------------+------------------------------------------------------------------
       W_DID |  .0047699   .0156527   .3047304   .7605715  -.0243498   .0370637
        W_TC |  .0266618   .0153468   1.737291   .0823359  -.0023919   .0537235
       W_CIC |  .0133223   .0128159   1.039512   .2985666  -.0180014   .0348044

[Raymond Zhang]

Thanks a lot.You solved my problem.