Hi,
I am running a trade gravity model.
When I run the model with OLS, the number of observations is the same even if I run the model without or with exporter-time and importer-time fixed effects.
However, when I run the model with PPMLHDFE the number of observations is higher when I run the model without the fixed effects than when I run the model with the fixed effects.
Which do you think could be the reason?
Thanks!
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