strat: An Implementation of the Stratification Index
An implementation of the stratification index proposed by Zhou (2012) <doi:10.1177/0081175012452207>.
The package provides two functions, srank, which returns stratum-specific
information, including population share and average percentile rank; and strat,
which returns the stratification index and its approximate standard error.
When a grouping factor is specified, strat also provides a detailed decomposition
of the overall stratification into between-group and within-group components.
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