Error: "type mismatch: exp.exp: transmorphic found where struct expected"

[Samyam Shrestha]

Hi,

I am trying to use synthetic difference-in-differences (Arkhangelsky et al., 2021) as an analytical tool. There is a Stata code called -sdid- as explained in this following github page: https://github.com/Daniel-Pailanir/sdid

I tried running the below demo code for practice but it gave me the "type mismatch: exp.exp: transmorphic found where struct expected" error. Would you please explain me what is wrong on my side? I'm using an older version of Stata, so do you think that's also causing it?

ssc install sdid, replace

net install sdid, from("https://raw.githubusercontent.com/daniel-pailanir/sdid/master") replace

webuse set www.damianclarke.net/stata/
webuse prop99_example.dta, clear

#delimit ;
sdid packspercapita state year treated, vce(placebo) reps(100) seed(1213) 
     graph g1_opt(xtitle("") ylabel(-35(5)10) scheme(plotplainblind)) 
     g2_opt(ylabel(0(50)150) xlabel(1970(5)2000) ytitle("Packs per capita") 
            xtitle("") text(125 1995 "ATT = -15.604" " SE = (9.209)") scheme(plotplainblind))
    graph_export(sdid_, .png) ;
#delimit cr

Thanks!

[Nick Cox]

The command is stated to require Stata 13. It would refuse to run altogether if your "older version" is 12 or less. That doesn't mean there may not be a version problem.

Does this imply that you can't replicate the authors' own example?

Damian Clarke is a member here.

[Samyam Shrestha]

Thanks! My Stata is version 14.0.

[Andrew Musau]

The same question was asked and resolved in https://www.statalist.org/forums/for...ger-2021/page2. See #18.

[Samyam Shrestha]

Thanks, Andrew Musau!

I checked that thread. It's mentioned that I should use the github version to install the command, not the ssc. I did that. Now, it is giving me a different error: "option matrow() not allowed". Any thoughts why this is happening, Daniel PV Damian Clarke ? Thanks so much!

[Andrew Musau]

If the authors do not get back to you here, you can send an email to them reporting the error.

[Daniel PV]

Hello Samyam Shrestha , I am so sorry about this! (and for being late to the post)
Yesterday I updated the sdid command on github, and completely forgot about the matrow() option in most old versions of stata. Thank you very much for posting the problem here.
I updated a few minutes ago a new version (on github) that I ran on Stata 13.0 and it works great!

Let me know if your issue is resolved!

[Samyam Shrestha]

Hello Samyam Shrestha , I am so sorry about this! (and for being late to the post)
Yesterday I updated the sdid command on github, and completely forgot about the matrow() option in most old versions of stata. Thank you very much for posting the problem here.
I updated a few minutes ago a new version (on github) that I ran on Stata 13.0 and it works great!

Let me know if your issue is resolved!

Great, it seems to be working. Thanks so much, Daniel PV !