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Panel data refers to multi-dimensional data frequently involving measurements over time in econometrics. It is also called longitudinal data in biostatistics.

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What percentage of a population needs a test in order to estimate prevalence of a disease? S...

I'll go in a somewhat different direction and say that it depends... Of course any sampling is based on the notion that the sampling is truly random. Trying to account for non-randomness in the samp …
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