Calculate Min & Max by Group in R (Example) | Base R, dplyr & data.table | How to Add as New Column

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Calculate Min & Max by Group & Add as New Column in R (2 Examples) | Append Variable to Data FrameПодробнее

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Select Row with Maximum or Minimum Value in Each Group in R (Example) | dplyr vs. data.table PackageПодробнее

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dplyr summary count and base R na.rm and is.naПодробнее

Find Earliest & Latest Date in R (Example) | Determine Min & Max Dates | as.Date & class FunctionsПодробнее