Panel minimum size. Could n= 10 and t= 3 be enough?

[Guest]

Hello everybody,

I would like to analyze a small sample with n= 20 and t=3 but now I realize that probably I have even less groups than I expected: n=10 instead of 20. Do you have any suggestion?
What would be the minimum size of a panel dataset? Probably n=10 and t=3 is too small but what about n=20 and t=3?

Thank to anyone will help me!

F.

[Carlo Lazzaro]

Guest:
welcome to this forum.
The main issue here is what you do not tell us, that is the number of predictors in the right-hand side of your regression equation.
As an aside please take a look at the FAQ and read about how to post more effectively. Thanks.

[Guest]

Thank you, Carlo.

Sorry, you are perfectly right. The number of predictors I would like to use is 3.

Kind regards,
F.

[Carlo Lazzaro]

Guest:
looking at Portnoy's suggested ratio (https://projecteuclid.org/euclid.aos/1176346793), that is [(constant+predictors)^2]/sample size that should ideally go to 0 as the sample size goes to infinity you have [(1+3)^2]/60=0.27 instead.
In absence of a heavy burden of missing values (please note that Stata applies listwise deletion: that is, each observation with at least one missing values in any of the variables will be omitted by default from the subsequent analysis), things should work.
As an aside, please note that your chances of getting (more) helpful replies are conditional on posting what you typed and what Stata gave you back within CODE delimiters (see the FAQ on this and other relevant topics). Thanks.