Error message - uno() invalid -- invalid numlist has too many elements

[tricaudc]

Dear Brian,

Thanks for the very useful synth_run package. I am using it on Stata (Stata version: 15.1 MP).
My setting is the following: I have a balanced panel consisting of 16,362 units of which 1,297 are treated and 15,065 are control and I am following them over a period of 15 years (from 2004 to 2018). The treatment period begins in 2010. I am using 16 predictor variables.
Note that the outcome variable I am considering is never missing.

When running the code I obtain the following error: "Error estimating treatment effect for unit 1075". After reading your answer in stackoverflow (https://stackoverflow.com/questions/48552687/error-estimating-treatment-effects-synth-runner), I used "trace" and recover the issue, the error message concerning this unit is the following: "uno() invalid -- invalid numlist has too many elements".

Do you know how I could solve this issue? Would it imply reducing my control group first, but then by how much?

Thanks in advance for your help

Preliminaries

Before submitting an issue, please check (with x in brackets) that you:

• Are using the newest release (see here for latest release version number).
• Have checked that the examples in the help work.
• Have read the help (HTML version).
• Have checked that there is not already an existing issues for what you are reporting.
• Have check running synth directly for one of the treated units works.

[sannanphan]

Hi @tricaudc, did you find a solution to your problem?

[liqizheng0328]

struggle with same question, it does not work in multiple treated group

[tricaudc]

Sorry just seeing this, I did not find the solution unfortunately

…

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[Jolijn99]

Hi! Does anyone have a solution for this issue? @tricaudc @sannanphan @liqizheng0328 @bquistorff @janvavra That would help me out a lot :)

[liqizheng0328]

Hi! Does anyone have a solution for this issue? @tricaudc @sannanphan @liqizheng0328 @bquistorff @janvavra That would help me out a lot :)

I suggest that you use gsynth (Yiqing Xu, 2017) package in r

[bquistorff]

If there's a reproducible example, that would help diagnose the issue. It's likely caused by a limit internal to Stata numlists (ref).

[joannarmathias]

I think this error is from having too many controls to choose from. I resolved it by limiting my sample through dropping very dissimilar potential control units.