I am new to R. I am using the plm package to run pooled OLS and Fixed Effect. My data set has 130 countries over 33 years with lots of missing values. My model has 9 independent variables. When I run my models I get the following:

Unbalanced Panel: n=34, T=1-6, N=61

Can any body explain this? Does it mean that 61 countries have observations for all 33 years across the 9 independent variables?

I saw the same question asked here: Interpreting plm output in R - number of observations used with very unbalanced panel

Please help if you can. Thanks.

  • $\begingroup$ See my answer to the same question here $\endgroup$ – Arne Jonas Warnke Jun 15 '16 at 15:39

Unbalanced panel simply means you have unequal observations (N) over time period (T) for different units (n, countries in your case).


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