This function applies the standardize function to each regional grouping and recombines the resutls into a single data frame.
Data frame with the data to be standardized.
Vecotr of names of columns to be standardized.
The means and scales for the transformations are stored in the mean and scale attributes of the output. Each is a list indexed by region, with each list element being a named vector indexed by variable.
Data frame with the requested variables standardized.
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