Is stationarity necessary for panel data?

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Said Jaouadi

stationarity test are necessary for panel, if you make mutliple regression.

But, you could also make a cointegration relationship if the variables are integrated with first order. I(1)

Feng Xu

You should do the unit root test first. If the null hypohtesis of unit root isn't rejected, co-intergration analysis is needed; otherwise, regression is enough.