I am using a package called
Code:
did_multiplegt
to run following Chaisemartin and D'Haultfoeuille in examining the impact of laws on a dependent variable y.
My code is

Code:
did_multiplegt y i t D , robust_dynamic dynamic(4) placebo(3) controls($control_list) breps(100) cluster(i)
The result is

Code:
DID estimators of the instantaneous treatment effect, of dynamic treatment effects if the dynamic option is used, and of placebo tests of the parallel trends assumption if
the placebo option is used. The estimators are robust to heterogeneous effects, and to dynamic effects if the robust_dynamic option is used.

             |  Estimate         SE      LB CI      UB CI          N  Switchers
-------------+------------------------------------------------------------------
    Effect_0 | -.0226619   .0061357  -.0346878  -.0106359      20592       4982
    Effect_1 |  -.017382   .0093775  -.0357619   .0009978      15723       4463
    Effect_2 |  .0054355   .0134015  -.0208315   .0317025      12417       4130
    Effect_3 |  .0698069   .0170375   .0364135   .1032004       9921       3839
    Effect_4 |  .1103436   .0194448   .0722318   .1484553       8957       3538
   Placebo_1 |  .0069436    .004159  -.0012081   .0150953      16863       3719
   Placebo_2 |  .0243217    .005671   .0132066   .0354368      12891       2796
   Placebo_3 |  .0110985   .0081419  -.0048597   .0270567       9075       2039
I also try to run the event_plot and I have the graph as below
Code:
event_plot e(estimates)#e(variances), default_look graph_opt(xtitle("Periods since the event") ytitle("Average causal effect") ///
    title("de Chaisemartin and D'Haultfoeuille (2020)") xlabel(-3(1)4)) stub_lag(Effect_#) stub_lead(Placebo_#) together
Array


But I do not know whether the laws affect the dependent y and whether the parallel trend is being satisfied.
And I try to apply

Code:
estat simple
as suggested by @FernandoRios and @George Ford in this discussion
But the result is that

Code:
estat simple not valid
By searching, I saw that I may use

Code:
estat summarize (equation), noomitted
But it still does not work

Code:
e(sample) information not available