# Articles by R on I Should Be Writing

### ggplot: Easy as pie (charts)

August 11, 2021 |

This post by no means endorses the use of pie charts. But, if you must, here’s how… For some reason, the top Google results for “ggplot2 pie chart” show some very convoluted code to accomplish what should be easy: Make slices Add labels to the mid...
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### ggplot: plot only some of the data

July 11, 2021 |

Often (especially when working with large and/or rich datasets) our (gg)plots can feel cluttered with information. But they don’t have to be! Let’s look at the following plot: Generate some data
```library(dplyr)

bfi <- psychTools::bfi %>%
mutate(
O = across(starts_with("O")) %>% rowMeans(na.rm = TRUE),
C = across(starts_with("C")) %>% rowMeans(na.rm = TRUE),
E = across(starts_with("E")) %>% rowMeans(na.rm = TRUE),
A = across(starts_with("A")) %>% rowMeans(na.rm = TRUE),
N = across(starts_with("N")) %>% rowMeans(na.rm = TRUE)
) %>%
mutate(
gender = factor(gender, labels = c("Man", "Woman")),
education = factor(education, labels = c("HS", "finished HS", "some college", "college graduate", "graduate degree"))
) %>%
select(gender, education, age, O:N) %>%
tidyr::drop_na(education) %>%
# multiply the data set
sample_n(size = 10000, replace = TRUE) %>%
# and add some noise
mutate(across(O:N, \(x) x + rnorm(x, 0, sd(x))))```
```library(ggplot2)

theme_set(theme_bw())

base_plot <- ggplot(bfi, aes(age, O, color = education)) +
facet_wrap(facets = vars(gender)) +
coord_cartesian(ylim = c(1, 6)) +
scale_color_viridis_d()

base_plot +
geom_point(shape = 16, alpha = 0.1) +
geom_smooth(se = FALSE)```
This is a busy plot. It’s hard to see what the each ...
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### Everything You Always Wanted to Know About ANOVA*

May 24, 2021 |

What is ANOVA? ANOVAs in R Simultaneous Sum of Squares Adding Interactions Balanced vs. Unbalanced Data ANOVA Made Easy Other Types of Models GLMs (G)LMMs Concluding Remarks The goals of this post are to (1) examine what ANOVAs are and are not, (2) demonstrate what the various types of ANOVAs are, ... [Read more...]

### ggplot: the placing and order of aesthetics matters

May 15, 2021 |

A group of people were asked to what degree they agree or disagree with a statement at two time points. Agreement
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