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| library(tidyverse) | |
| # find duplicates by col | |
| df %>% filter(n() > 1, .by = "col") | |
| # drop duplicates by col | |
| df %>% distinct(col) | |
| # summarize per group by | |
| mtcars %>% | |
| group_by(cyl) %>% | |
| summarize(mean = mean(disp), n = n()) |
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