Creating dummy variable to indicate if trend increasing or decreasing

[Rajwane Kafrouni]

Hello!

I am working on a panel dataset.

I want to create a dummy variable that indicates weither my hp trend variable is increasing or declining for each country (Dummy =1 if trend is increasing for country i and 0 if declining).

How I can do this in stata? I believe I have to start with the gen Dummy=1 if ...

I don't know what to use after " if " for that condition.

Thank you in advance.

[Nick Cox]

A serious question is what your definition of increasing or declining is. Is it monotonic change with no exception? A positive/negative Pearson correlation? Spearman correlation? Which way would a constant outcome be classified? Are you satisfied with comparing just first and last values?