ggplot & the tidyverse – Learning | Assessment

Data Visualization in R Using ggplot2 - Module 1

library(tidyverse)

── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
✔ dplyr     1.1.4     ✔ readr     2.1.5
✔ forcats   1.0.0     ✔ stringr   1.5.1
✔ ggplot2   3.5.1     ✔ tibble    3.2.1
✔ lubridate 1.9.3     ✔ tidyr     1.3.1
✔ purrr     1.0.2     
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

data(PlantGrowth) 
str(PlantGrowth)

'data.frame':   30 obs. of  2 variables:
 $ weight: num  4.17 5.58 5.18 6.11 4.5 4.61 5.17 4.53 5.33 5.14 ...
 $ group : Factor w/ 3 levels "ctrl","trt1",..: 1 1 1 1 1 1 1 1 1 1 ...

view(PlantGrowth)

plot(density(PlantGrowth$weight))                         # Density plot using base R

ggplot(data = PlantGrowth,
    aes(x = weight,
    color = group)) +
    geom_density()

ggplot(data = PlantGrowth,
    aes(x = weight,
    fill = group)) +
    geom_density()

ggplot(data = PlantGrowth,
    aes(x = weight,
    fill = group)) +
    geom_density(alpha = 0.3)

  PlantGrowth_grouped <- PlantGrowth %>%                    # Group data using dplyr
  group_by(group) %>% 
  summarize(mean_weight = mean(weight))
PlantGrowth_grouped

# A tibble: 3 × 2
  group mean_weight
  <fct>       <dbl>
1 ctrl         5.03
2 trt1         4.66
3 trt2         5.53

ggplot(data = PlantGrowth_grouped,                        # ggplot2 bar chart
       aes(x = group,
           y = mean_weight)) +
  geom_col()

PlantGrowth %>%                                           # Manipulation & visualization
  group_by(group) %>% 
  summarize(mean_weight = mean(weight)) %>% 
  ggplot(aes(x = group,
             y = mean_weight)) +
  geom_col()