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Chapter 13 (numbers): minor updates (#1627) 

* numbers.qmd: improve variable name for IQR

* numbers.qmd: textual fix
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Floris Vanderhaeghe 2024-02-02 01:41:06 +01:00 committed by GitHub
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@ -643,11 +643,11 @@ But the code below reveals a data oddity for airport [EGE](https://en.wikipedia.
flights |> flights |>
group_by(origin, dest) |> group_by(origin, dest) |>
summarize( summarize(
distance_sd = IQR(distance), distance_iqr = IQR(distance),
n = n(), n = n(),
.groups = "drop" .groups = "drop"
) |> ) |>
filter(distance_sd > 0) filter(distance_iqr > 0)
``` ```
### Distributions ### Distributions
@ -717,7 +717,7 @@ Finally, don't forget what you learned in @sec-sample-size: whenever creating nu
There's one final type of summary that's useful for numeric vectors, but also works with every other type of value: extracting a value at a specific position: `first(x)`, `last(x)`, and `nth(x, n)`. There's one final type of summary that's useful for numeric vectors, but also works with every other type of value: extracting a value at a specific position: `first(x)`, `last(x)`, and `nth(x, n)`.
For example, we can find the first and last departure for each day: For example, we can find the first, fifth and last departure for each day:
```{r} ```{r}
flights |> flights |>