Calculate group mean, sum, or other summary stats. and assign column to original data

Have a look at the ave function. Something like

df$grp.mean.values <- ave(df$value, df$group)

If you want to use ave to calculate something else per group, you need to specify FUN = your-desired-function, e.g. FUN = min:

df$grp.min <- ave(df$value, df$group, FUN = min)

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