Definition:
In a panel data set, there are observations across cross-section units
(e.g. individuals or firms), and across time periods. Often such a data set
can be represented by a completely filled in matrix of N units and T periods.
In the unbalanced data case, however, the number of observations
per time period varies. (Equivalently one might say that the number of
observations per unit is not always the same.) One might handle this by
letting T be the total number of time periods and Nt be the number
of observations in each period.
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