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Hello. I am making a research on renationship between countries GDP, population number and Energy consumption. Dependent Variable is energy consumption.
I have preapred panel data for 159 countries and time is 2008-2013. Unit root test show, that GDP and Energy consumption are stationary at 1st difference. I created new series of 1st differences for this varibles.

My issue is following: The new series have a lot of NA values :( . Can someone advise me how to be in this situation and how to continue.
Thanks in advance.

I would attch my workfile as well.

Thanks and regards

Ara

You may have typed the commands incorrectly. For example,
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Thanks for your Comment. I t helped a lot. The problem was solved by your advise.

May I ask if someone can help me with steps or with a guide papare how to do ARIMA forecast with Panel data?

I have Electiricty consumption, GDP and Population umber for 159 countries from 2008 to 2013. I made stationarity test and found that they are stationar n 1st difference, exceptPopulation, which is stationar in level.

Now can anyone helo me with next steps ( please ndicate just actions, and I would find deeper inforation in web).

Thanks in advance