Common Warnings

Grouped output warning

Matches: has grouped output.*\.groups

WHAT THIS ERROR MEANS

After summarise(), dplyr warns about the grouping structure of the result. This is informational — it tells you whether groups were dropped or kept.

1. Add .groups argument to suppress: summarise(..., .groups = 'drop').

2. Use ungroup() after summarise if you want no grouping.

3. This is just a message, not an error — your code still works.

BAD — THIS CAUSES THE ERROR

df %>% group_by(a, b) %>% summarise(n = n())

GOOD — CORRECT APPROACH

df %>% group_by(a, b) %>% summarise(n = n(), .groups = "drop")

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