diff --git a/_quarto.yml b/_quarto.yml
index 983ad4a..4768ee9 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -12,8 +12,8 @@ book:
Çetinkaya-Rundel, and Garrett Grolemund.
right: |
This book was built with Quarto.
- cover-image: cover.png
- favicon: cover.png
+ cover-image: cover.jpg
+ favicon: cover.jpg
site-url: https://r4ds.hadley.nz/
repo-url: https://github.com/hadley/r4ds/
repo-branch: main
diff --git a/cover.jpg b/cover.jpg
new file mode 100644
index 0000000..fbe1bff
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diff --git a/cover.png b/cover.png
deleted file mode 100644
index a7150bd..0000000
Binary files a/cover.png and /dev/null differ
diff --git a/data-tidy.qmd b/data-tidy.qmd
index 6ecb267..f637762 100644
--- a/data-tidy.qmd
+++ b/data-tidy.qmd
@@ -350,7 +350,7 @@ There are two columns that are already variables and are easy to interpret: `cou
They are followed by 56 columns like `sp_m_014`, `ep_m_4554`, and `rel_m_3544`.
If you stare at these columns for long enough, you'll notice there's a pattern.
Each column name is made up of three pieces separated by `_`.
-The first piece, `sp`/`rel`/`ep`, describes the method used for the diagnosis, the second piece, `m`/`f` is the `gender` (coded as a binary variable in this dataset), and the third piece, `014`/`1524`/`2534`/`3544`/`4554`/``` 5564/``65 ``` is the `age` range (`014` represents 0-14, for example).
+The first piece, `sp`/`rel`/`ep`, describes the method used for the diagnosis, the second piece, `m`/`f` is the `gender` (coded as a binary variable in this dataset), and the third piece, `014`/`1524`/`2534`/`3544`/`4554`/`5564`/`65` is the `age` range (`014` represents 0-14, for example).
So in this case we have six pieces of information recorded in `who2`: the country and the year (already columns); the method of diagnosis, the gender category, and the age range category (contained in the other column names); and the count of patients in that category (cell values).
To organize these six pieces of information in six separate columns, we use `pivot_longer()` with a vector of column names for `names_to` and instructors for splitting the original variable names into pieces for `names_sep` as well as a column name for `values_to`:
@@ -422,15 +422,15 @@ When you use `".value"` in `names_to`, the column names in the input contribute
#| label: fig-pivot-names-and-values
#| echo: false
#| fig-cap: >
-#| Pivoting with `names_to = c(".value", "id")` splits the column names
+#| Pivoting with `names_to = c(".value", "num")` splits the column names
#| into two components: the first part determines the output column
#| name (`x` or `y`), and the second part determines the value of the
-#| `id` column.
+#| `num` column.
#| fig-alt: >
#| A diagram that uses color to illustrate how the special ".value"
#| sentinel works. The input has names "x_1", "x_2", "y_1", and "y_2",
#| and we want to use the first component ("x", "y") as a variable name
-#| and the second ("1", "2") as the value for a new "id" column.
+#| and the second ("1", "2") as the value for a new "num" column.
knitr::include_graphics("diagrams/tidy-data/names-and-values.png", dpi = 270)
```
diff --git a/diagrams/tidy-data.graffle b/diagrams/tidy-data.graffle
index 6e8a605..f394d3a 100644
Binary files a/diagrams/tidy-data.graffle and b/diagrams/tidy-data.graffle differ
diff --git a/diagrams/tidy-data/names-and-values.png b/diagrams/tidy-data/names-and-values.png
index 307efc5..b17416e 100644
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diff --git a/numbers.qmd b/numbers.qmd
index e4cda19..3c2684a 100644
--- a/numbers.qmd
+++ b/numbers.qmd
@@ -373,7 +373,7 @@ x <- 1:10
cumsum(x)
```
-If you need more complex rolling or sliding aggregates, try the [slider](https://slider.r-lib.org/) package by Davis Vaughan.
+If you need more complex rolling or sliding aggregates, try the [slider](https://slider.r-lib.org/) package.
### Exercises
diff --git a/quarto-formats.qmd b/quarto-formats.qmd
index 7488d71..49f3b0e 100644
--- a/quarto-formats.qmd
+++ b/quarto-formats.qmd
@@ -245,7 +245,7 @@ cat(readr::read_file("quarto/example-book.yml"))
```
We recommend that you use an RStudio project for your websites and books.
-Based on the `_quarto.yml` file, RStudio will recognize the type of project you're working on, and add a Built tab to the IDE that you can use to render and preview your websites and books.
+Based on the `_quarto.yml` file, RStudio will recognize the type of project you're working on, and add a Build tab to the IDE that you can use to render and preview your websites and books.
Both websites and books can also be rendered using `quarto::render()`.
Read more at about Quarto websites and about books.