issues with clustering - insufficient observations about ivreghdfe HOT 6 CLOSED

Same problem occurred. Is there a way to figure it out? @nikhilklath @sergiocorreia Thx.

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What do you get if you

a) Run ivreghdfe with the keepsingleton option
b) Just run the reduced form or the first stage with reghdfe?

I'm asking this because I suspect you might have insufficient observations if there are a lot of singletons.

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What I found to work finally was that I unstalled all the packages (ftools, ivreghdfe, reghdfe, ivreg2) and reinstalled all of then from ssc install and not net install. My best guess was that the older version worked well and the more recent version had some change that made at least my code to not work.

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uninstall and use ssc install to install again works for me too. BTW, I didn't impose ivreghdfe to keep singletons obs. @sergiocorreia

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I also have the same issue when using ivreghdfe with the absorb and cluster options; it reports insufficient observations and no singleton. Furthermore, there is no such issue now that the cluster option has been removed.

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Fixed by sergiocorreia/reghdfe@e73880c !

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