R Tip: Use `.by` in `dplyr::mutate()` for group-specific transformations without `group_by()`. Just:
df %>% mutate(new_var = mean(value), .by = group)
No extra grouping or ungrouping needed! Learn more:
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Enhancing Data Transformations in R with the .by Argument in dplyr::mutate
Introduction R’s dplyr package has long been a powerhouse for data manipulation, providing intuitive, pipeline-friendly verbs for common data wrangling tasks. Among these, mutate() stands out for its ...