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Date   Mon, 21 Feb 2011 16:16:56 +0000

Hello. I'm trying to fit an econometric model (with panel data). However, each variable has 9 million rows and the calculations take forever. Thus, I took a stratified sample (1.5 million rows per variable) which I used to fit the model. What problems would I meet using this big sample? Are the estimated coefficients reliable? Thank you

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