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Hi, I'm suffering with the issue that I got massage of insufficient no. of observations when I try to estimate a series that is log of square of another. I'm having balance panel data. how can I overcome this issue?

Get more observations.

I have a panel of 340 observations. t=34 and N=10. the problem appear when I use log of GDP per capital series. without this variable estimation show no problem but I can't exclude this variable, I'm using eview 8.no observation of this series is missing.

Post your workfile, including the equation you are estimating.

I'm uploading my file here. my regression equ is lngini=lngdppc lngdppcs I want to estimate Johnson cointegration anf fully modified ols.

lngdppc=2*lngdppcs

thanks 4 ur help but problem is still there. when I use johanson cointegration by including this series (this time calculated through 2*lngdppc) I got a box indicating insufficient observations.