stratamatch

A pilot matching design to automatically stratify and match large datasets. The `manual_stratify()` function allows users to manually stratify a dataset based on categorical variables of interest, while the `auto_stratify()` function does automatically by allocating a held-aside (pilot) data set, fitting a prognostic score (see Hansen (2008) doi:10.1093/biomet/asn004) on the pilot set, and stratifying the data set based on prognostic score quantiles. The `strata_match()` function then does optimal matching of the data set in parallel within strata.

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