Drop countries

[Vironia Isaac]

Dear All,
in my panel dataset, there are 3 countries that whenever i drop them, the model won't run. that's so woried, why this would happen?

[Marcos Almeida]

Please inform exactly what you typed and what Stata gave you back. Sharing a fraction of the data - please use dataex for the matter - helps to clarify the query.

[Phil Bromiley]

You'll increase your chances of a helpful answer by following the FAQ on asking questions - provide Stata code in code delimiters, readable Stata output, and sample data using dataex.

In addition to Marcos' helpful response, it sounds like the usable observations are all for those three countries.