Frequently Asked Questions for Synth
Synth for Stata
1. The code stops with an error message.
What should I do?
Most problems can be solved by exactly
repeating the following steps:
a) close your Stata and reopen it
b) type: "update
all" (and if asked "update
swap" to fully install newly
updated executables)
c) type:
net from
"http://www.mit.edu/~jhainm/Synth"
net install synth, all replace
force
In most cases the code
should run now.
2. When installing the program using net
install I get the following error message:
Could not load plugin:
c:\ado\plus\s\synthopt.plugin
(error occurred while loading synth.ado)
This means that a plugin is not availbale
for your platform (see here details). You can email us and
we will send you the C code for the plugin
so you can compile it on your platform.
3. How can I improve the fit for the
pre-treatment ouctomes?
Use the "nested" and the "nested allopt"
option. Also try to add more pre-treatment
years of the ouctome variable. Finally,
trim the donor pool to units that are
sufficiently close to the treated unit.
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