wooldid
Table of contents
Installation and options
ssc install wooldid, replace
Take a look at the help file:
help wooldid
Test the command
Please make sure that you generate the data using the script given here
Let’s try the basic wooldid command:
wooldid Y id t first_treat, cluster(id) makeplots espre(10) espost(10)
which will show this output:
Wooldid Estimation for Outcome: Y; Standard Errors: cluster(id)
N clusters = 30; N = 1800 (0 obs dropped from initial sample)
R2 = 0.9999; R2adj = 0.9999; R2-within = 0.9998; R2-withinadj = 0.9996
Main Results (Full Estimation Sample):
| estimate se t p lb_95ci ub_95ci relyr
-------------+----------------------------------------------------------------------------
main |
att | 131.3168 .1310143 1002.309 2.20e-67 131.0489 131.5848 .
-------------+----------------------------------------------------------------------------
pretreatment |
att | -.007817 .0903115 -.0865564 .931619 -.1925249 .1768908 .
-------------+----------------------------------------------------------------------------
ES_att |
pre10 | .1113455 .1991685 .5590516 .5804185 -.2959998 .5186908 -10
pre9 | .010334 .1269376 .0814101 .9356751 -.2492825 .2699505 -9
pre8 | .0441961 .132331 .3339814 .7407968 -.2264512 .3148434 -8
pre7 | -.2270929 .2125164 -1.06859 .2940691 -.6617378 .2075519 -7
pre6 | -.3134442 .1873483 -1.673056 .1050718 -.6966146 .0697262 -6
pre5 | -.2442293 .2393161 -1.02053 .3159158 -.7336857 .2452272 -5
pre4 | .0592312 .2598119 .2279771 .8212638 -.4721439 .5906063 -4
pre3 | .1010662 .1838977 .5495784 .5868163 -.2750468 .4771791 -3
pre2 | .2354845 .256337 .9186517 .3658558 -.2887837 .7597526 -2
pre1 | .1449385 .205954 .7037422 .4872058 -.2762847 .5661618 -1
contemp | .0880106 .1690873 .5205039 .6066639 -.2578117 .4338329 0
post1 | 8.668803 .1773712 48.8738 2.07e-29 8.306039 9.031568 1
post2 | 17.81067 .2636722 67.54853 1.88e-33 17.2714 18.34994 2
post3 | 26.04074 .1457741 178.6376 1.15e-45 25.7426 26.33888 3
post4 | 34.75516 .1880117 184.8564 4.25e-46 34.37064 35.13969 4
post5 | 42.85557 .2933104 146.11 3.87e-43 42.25569 43.45546 5
post6 | 51.99085 .2483759 209.3233 1.16e-47 51.48287 52.49884 6
post7 | 60.2264 .2170374 277.4932 3.27e-51 59.78251 60.6703 7
post8 | 68.99828 .2877645 239.7734 2.26e-49 68.40973 69.58682 8
post9 | 77.37 .3005877 257.3958 2.90e-50 76.75523 77.98477 9
The command also has a built in graph option which gives us:
