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What is the difference between corr() and cov() with panel data?
What is the difference between corr() and cov() with panel data?

When is it more appropriate to use cov() vs corr() for the residual structures for panel data?

Example Code:

xtpoisson Outcome CovariateA##CovariateB CovariateC CovariateD, exposure(area) corr(exchangeable)

xtnbreg Outcome CovariateA##CovariateB CovariateC CovariateD, exposure(area) corr(independent)

mepoisson Outcome CovariateA##CovariateB CovariateC CovariateD, exposure(area) || GroupID:, covariance(unstructured)

menbreg Outcome CovariateA##CovariateB CovariateC CovariateD, exposure(area) || GroupID:, covariance(unstructured)

glm Outcome CovariateA##CovariateB CovariateC CovariateD, exposure(area) vce(robust) family(gamma) link(identity)

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What is the difference between corr() and cov() with panel data?

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