bubble_charts.qmd

# Bubble charts {#sec-bubble-charts}

```{r}
#| label: setup
#| message: false
#| warning: false
#| include: false
library(tidyverse)
library(lubridate)
library(scales)
library(knitr)
library(kableExtra)
library(colorblindr)
library(downlit)
# fonts ----
library(extrafont)
library(sysfonts)
source("_common.R")
# use font
showtext::showtext_auto()
# set theme
ggplot2::theme_set(theme_ggp2g(
    base_size = 15))
```

```{r}
#| label: status
#| results: "asis"
#| echo: false
# status ----
# polish, dev, draft, complete
status("complete")
```


:::: {.callout-note collapse="false" icon=false}

<br>

```{r}
#| label: full_code_display
#| eval: true
#| echo: false
#| warning: false
#| message: false
#| out-height: '60%'
#| out-width: '60%'
#| fig-align: right
library(palmerpenguins) 
library(ggplot2)
labs_bubble <- labs(
  title = "Bill Length vs. Flipper Length",
  x = "Bill Length (mm)", y = "Flipper length (mm)", 
  size = "Body Mass (g)")

ggp2_bubble <- penguins |> 
  ggplot(
    aes(x = bill_length_mm, y = flipper_length_mm)) + 
  geom_point(aes(size = body_mass_g), alpha = 1/3) + 
  scale_size(range = c(.1, 10), 
             name = "Body Mass (g)") + 
  theme(legend.position = "bottom")

ggp2_bubble + 
  labs_bubble
```


::: {style="font-size: 1.10em; color: #02577A;"}
**This graph requires:**
:::

::: {style="font-size: 1.05em; color: #282b2d;"}
**`r emo::ji("check")` three numeric (continuous) variables**
:::

::::

## Description 

Bubble graphs display relationships between three numeric (continuous) variables.

The position on the `x` and `y` axis illustrates the relationship between the first two variables, and the `size` of the point (i.e., the bubble) conveys the numeric value of the third. 

## Set up

::: {style="font-size: 1.15em; color: #1e83c8;"}
**PACKAGES:**
:::

Install packages.


::: {style="font-size: 0.85em;"}
```{r}
#| label: pkg_code_bubble
#| code-fold: show
#| eval: false
#| echo: true
#| warning: false
#| message: false
#| results: hide
install.packages("palmerpenguins")
library(palmerpenguins)
library(ggplot2)
```
:::


::: {style="font-size: 1.15em; color: #1e83c8;"}
**DATA:**
:::

::: {.column-margin}
![Artwork by allison horst](www/lter_penguins.png){fig-align="right" width="100%" height="100%"}
:::


The `penguins` data.

::: {style="font-size: 0.85em;"}
```{r}
#| label: data_code_bubble
#| code-fold: show
#| eval: true
#| echo: true
penguins <- palmerpenguins::penguins
glimpse(penguins)
```
:::

## Grammar

::: {style="font-size: 1.15em; color: #1e83c8;"}
**CODE:**
:::

  - Create labels with `labs()`

  - Map `bill_length_mm` to `x` axis

  - Map `flipper_length_mm` to `y` axis 

  - Map `body_mass_g` to `size`  

  - Set `alpha` to `1/3`  

  - Add `scale_size()`, set the `range` to `c(0.1, 10)` and `name` to `"Body Mass (g)"`

  - Move the legend to the bottom of the graph with `theme(legend.position = "bottom")`

::: {style="font-size: 0.85em;"}
```{r}
#| label: code_graph_bubble
#| code-fold: show
#| eval: false
#| echo: true 
#| warning: false
#| message: false
#| out-height: '100%'
#| out-width: '100%'
labs_bubble <- labs(
  title = "Bill Length vs. Flipper Length",
  x = "Bill Length (mm)", y = "Flipper length (mm)", 
  size = "Body Mass (g)")

ggp2_bubble <- penguins |> 
  ggplot(
    aes(x = bill_length_mm, y = flipper_length_mm)) + 
  geom_point(aes(size = body_mass_g), alpha = 1/3) + 
  scale_size(range = c(.1, 10), 
             name = "Body Mass (g)") + 
  theme(legend.position = "bottom")

ggp2_bubble + 
  labs_bubble
```
:::


::: {style="font-size: 1.15em; color: #1e83c8;"}
**GRAPH:**
:::

```{r}
#| label: create_graph_bubble
#| eval: true
#| echo: false
#| warning: false
#| message: false
#| out-height: '100%'
#| out-width: '100%'
#| layout-nrow: 1
#| column: page-inset-right
labs_bubble <- labs(
  title = "Bill Length vs. Flipper Length",
  x = "Bill Length (mm)", y = "Flipper length (mm)", 
  size = "Body Mass (g)")

ggp2_bubble <- penguins |> 
  ggplot(
    aes(x = bill_length_mm, y = flipper_length_mm)) + 
  geom_point(aes(size = body_mass_g), alpha = 1/3) + 
  scale_size(range = c(.1, 10), 
             name = "Body Mass (g)") + 
  theme(legend.position = "bottom")

ggp2_bubble + 
  labs_bubble
```