groupStatI | R Documentation |
This function applies a specified function to each group defined by an index, and returns a summary of the results. It is useful for summarizing data by group when the groups are defined by an index rather than a named column.
groupStatI(f, x, idx)
f |
A function that takes a single argument and returns a summary of the data. |
x |
A data frame or matrix containing the data to be summarized. |
idx |
A vector of indices or group names that define the groups. |
A data frame or matrix containing the summary statistics for each group.
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