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logicals.qmd: use better variable names in example (#1623) 

The variable names of this example were copied from the previous example, where logical vectors were summarized with `any()` and `all()`. However the present example the summary is with `sum()` and `mean()`, which was not updated in the variable names.
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Floris Vanderhaeghe 2024-01-29 02:11:21 +01:00 committed by GitHub
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@ -360,8 +360,8 @@ That, for example, allows us to see the proportion of flights that were delayed
flights |>
group_by(year, month, day) |>
summarize(
all_delayed = mean(dep_delay <= 60, na.rm = TRUE),
any_long_delay = sum(arr_delay >= 300, na.rm = TRUE),
proportion_delayed = mean(dep_delay <= 60, na.rm = TRUE),
count_long_delay = sum(arr_delay >= 300, na.rm = TRUE),
.groups = "drop"
)
```