[英]How to include the results of a statistical test as a plotmath expression in ggplot2 facet
我希望在多面 ggplot 图表中包含多个统计测试的结果。
我找到了很多关于如何在标题或注释中包含类似内容的优秀示例(如this ),但是,我的兴趣在于将其作为文本注释包含在内,以便我可以在一个图形上显示许多测试的结果。
我已经能够使用标准文本注释来做到这一点,但是我想使用polymath
/ expressions
来呈现我的结果,以便我可以生成遵循 package [ggstatsplot]
1中实现的 APA 样式指南的注释,请参见下面的示例:
我使用来自ggplot2
的diamonds
数据包含了一个可重现示例的代码。 我尝试过的一些事情包括:
bquote
和expression
对象存储为wilcox_stats
object 中的列 - 但是 dplyr 似乎不喜欢它ggplot
调用这一切——但是尝试排除geom_text
想要打印的所有注释变得非常混乱您可以提供的任何帮助或指示将不胜感激。
# LOAD REQUIRED PACKAGES
library(ggplot2)
library(tidyverse)
library(rstatix)
# CREATE SAMPLE DATA
sample_data <- diamonds %>%
select(cut, color, table) %>%
filter(color == c("E","J")) %>%
mutate(time = factor(case_when(
table %% 2 == 0 ~ "Before",
TRUE ~ "After"))) %>%
group_by(color, time) %>%
sample_n(100) %>%
ungroup() %>%
mutate(numeric_cut = case_when(
cut == "Ideal" ~ 1,
cut == "Premium" ~ 2,
cut == "Very Good" ~ 3,
cut == "Good" ~ 4,
cut == "Fair" ~ 5))
# STAT TESTS
wilcox_test <- sample_data %>%
group_by(color) %>%
wilcox_test(numeric_cut ~ time, paired = TRUE, detailed = TRUE) %>%
select(color, statistic, p, n1)
wilcox_es <- sample_data %>%
group_by(color) %>%
wilcox_effsize(numeric_cut ~ time, paired = TRUE, ci = TRUE) %>%
select(color, effsize, conf.low, conf.high)
## EXTRACT ELEMENTS OF STAT TESTS AND USE THEM TO CREATE ANNOTATION
wilcox_stats <- left_join(wilcox_test, wilcox_es) %>%
mutate(statistic = round(statistic, 1)) %>%
mutate(effsize = round(effsize, 2)) %>%
mutate(p = round(p, 3)) %>%
mutate(result = deparse(bquote(
V[Wilcoxon]==.(statistic)~ #this code does not work
italics(p)==.p~
hat(r) == .effsize~
"CI"["95%"]~
.conf.low~.conf.high~
n[pairs]==.n1)))
## PREPARE PLOT DATA
plot_data <- sample_data %>%
group_by(time, cut, color) %>%
tally() %>%
ungroup() %>%
group_by(color) %>%
mutate(total_n = sum(n)) %>%
mutate(percent = (n/total_n)*100) %>%
mutate(percent = round(percent, 1)) %>%
ungroup() %>%
left_join(wilcox_stats) %>%
mutate(result = case_when(
time == "Before" & cut == "Ideal" ~ "",
time == "After" & cut == "Ideal" ~ "",
time == "Before" & cut == "Premium" ~ "",
time == "After" & cut == "Premium" ~ "",
time == "Before" & cut == "Very Good" ~ "",
time == "After" & cut == "Very Good" ~ result,
time == "Before" & cut == "Good" ~ "",
time == "After" & cut == "Good" ~ "",
time == "Before" & cut == "Fair" ~ "",
time == "After" & cut == "Fair" ~ "")) %>%
mutate(time = factor(time, levels = c("Before", "After", ordered = TRUE)))
## PLOT RESULTS
plot <- plot_data %>%
ggplot() +
aes(x = cut, y = percent, fill = cut) +
geom_bar(stat = "identity") +
geom_text(aes(label = result, y = 30), size = 5, parse = TRUE) +
facet_grid(color ~ time)
下图显示了我希望创建的 output 的要点...
我可能会使用粘贴创建表达式,(tbh,因为我发现包含变量更容易)。
我稍微缩短了代码,也没有使用你的完整表达,但我认为它应该足以让你明白这一点。
library(tidyverse)
sample_data <- diamonds %>%
select(cut, color, table) %>%
filter(color == c("E","J")) %>%
mutate(time = if_else(table %% 2 == 0, "Before", "After")) %>%
group_by(color, time) %>%
sample_n(100) %>%
ungroup() %>%
mutate(numeric_cut = as.numeric(cut))
wilcox_test <- sample_data %>%
group_by(color) %>%
rstatix::wilcox_test(numeric_cut ~ time, paired = TRUE, detailed = TRUE) %>%
select(color, statistic, p, n1)
wilcox_es <- sample_data %>%
group_by(color) %>%
rstatix::wilcox_effsize(numeric_cut ~ time, paired = TRUE, ci = TRUE) %>%
select(color, effsize, conf.low, conf.high)
这里是关键点
wilcox_stats <- left_join(wilcox_test, wilcox_es) %>%
mutate(statistic = round(statistic, 1),
effsize = round(effsize, 2),
p = round(p, 3),
label = paste('V[Wilcoxon]==', statistic, '~italic(p)==~', p))
#> Joining, by = "color"
plot_data <- sample_data %>%
count(time, cut, color) %>%
group_by(color) %>%
mutate(total_n = sum(n),
percent = round((n/total_n)*100,1)) %>%
ungroup() %>%
left_join(wilcox_stats) %>%
mutate(result = if_else(time == "After" & cut == "Very Good", label, ""))
#> Joining, by = "color"
plot_data %>%
ggplot() +
aes(x = cut, y = percent, fill = cut) +
geom_bar(stat = "identity") +
geom_text(aes(label = result, y = 30), parse = TRUE) +
facet_grid(color ~ time)
由代表 package (v0.3.0) 于 2020 年 4 月 26 日创建
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