how to put void data to dataframe?

Sorry in advance for my breaking English...

I am now participating in the project that studies on international trade.
I collected all the binary trade data in CSV format. (Reporter countries / Partner countries / trade value)
The problem here is that to conduct regression analysis or other measures, I need "no trade" data along with trade data so that I can figure out the reason for trade. I have collected all the countries ISO (country code) and I want to know if there is a way to make this no trade data into my dataframe.

Thanks a lot for reading my text and I would be really pleased to see your comments...


To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.