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[英]How to correct plot width + correct labels position in R (ggplot2)
[英]ggplot: how to "correct" an unrepresentative spike in the plot
我有沿日期時間(日期和小時:分鍾:秒)的百分比分數數據。 我想以圖形方式“糾正”/突出顯示不具有代表性的數據點。
我有關於人們每天如何評價他們的幸福水平的數據,在 0 -> 1 的連續范圍內,其中 0 表示“非常不開心”,1 表示“非常開心”。 我問了很多人,希望隨着時間的推移獲得“群體中的幸福感”。
library(tidyverse)
library(lubridate)
set.seed(1234)
original_df <-
seq(as.POSIXct('2020-09-01', tz = "UTC"), as.POSIXct('2020-09-15', tz = "UTC"), by="1 mins") %>%
sample(15000, replace = T) %>%
as_tibble %>%
rename(date_time = value) %>%
mutate(date = date(date_time)) %>%
add_column(score = runif(15000))
original_df
## # A tibble: 15,000 x 3
## date_time date score
## <dttm> <date> <dbl>
## 1 2020-09-06 04:11:00 2020-09-06 0.683
## 2 2020-09-06 13:35:00 2020-09-06 0.931
## 3 2020-09-05 23:21:00 2020-09-05 0.121
## 4 2020-09-06 14:45:00 2020-09-06 0.144
## 5 2020-09-07 09:15:00 2020-09-07 0.412
## 6 2020-09-01 10:22:00 2020-09-01 0.564
## 7 2020-09-11 14:00:00 2020-09-11 0.960
## 8 2020-09-08 13:24:00 2020-09-08 0.845
## 9 2020-09-01 15:33:00 2020-09-01 0.225
## 10 2020-09-09 19:27:00 2020-09-09 0.815
## # ... with 14,990 more rows
actual_df <-
original_df %>%
filter(date %in% as_date("2020-09-10")) %>%
group_by(date) %>%
slice_sample(n = 15) %>%
ungroup %>%
bind_rows(original_df %>% filter(!date %in% as_date("2020-09-10")))
> actual_df %>% count(date)
## # A tibble: 14 x 2
## date n
## <date> <int>
## 1 2020-09-01 1073
## 2 2020-09-02 1079
## 3 2020-09-03 1118
## 4 2020-09-04 1036
## 5 2020-09-05 1025
## 6 2020-09-06 1089
## 7 2020-09-07 1040
## 8 2020-09-08 1186
## 9 2020-09-09 1098
## 10 2020-09-10 15 ## <- this day has less data
## 11 2020-09-11 1095
## 12 2020-09-12 1051
## 13 2020-09-13 1037
## 14 2020-09-14 1034
我將每一天視為一個因素,並得到每日平均值。 從統計上講,這個解決方案可能遠非理想,正如@BrianLang 在下面評論的那樣。 但是,現在這是我選擇的方法。
library(emmeans)
model_fit <-
actual_df %>%
mutate(across(date, factor)) %>%
lm(score ~ date, data = .)
emmeans_fit_data <- emmeans(model_fit, ~ date, CIs = TRUE)
emmeans_fit_data %>%
as_tibble %>%
ggplot(data = ., aes(x = date, y = emmean)) +
geom_line(color = "#1a476f", group = 1, lwd = 1) +
geom_errorbar(aes(ymin = lower.CL, ymax = upper.CL), alpha = 0.5, color = "#90353b", width = 0.2) +
geom_text(aes(label = paste0(round(100*emmean, 1), "%") , color = "90353b"), vjust = -4, hjust = 0.5, size = 3.5) +
geom_point(color = "1a476f") +
scale_y_continuous(labels = function(x) paste0(100*x, "%")) +
ylab("Level of Happiness") +
xlab("Date") +
ggtitle("Mood Over Time") +
theme(plot.title = element_text(hjust = 0.5, size = 14),
axis.text.x=element_text(angle = -60, hjust = 0),
axis.title.x = element_blank(),
legend.title = element_blank(),
plot.caption = element_text(hjust = 0, size = 8),
legend.position = "none")
但是后來我在 2020 年 9 月 10 日得到了這個峰值,這只是由於數據點數量很少。 一種圖形解決方案是做一些事情,比如用足夠的數據點划出有問題的線並“完成”它的外觀。 也許基於前一天和后一天的平均值? 我不想擺脫真實數據,但確實想以圖形方式強調這是不具有代表性的,並且實際值應該更接近前一天和后一天。 我在想使用虛線是一個合理的圖形解決方案。
否則,我希望可以有一種不同的方法來使用ggplot
的平滑來建模/繪制這種“按時間”數據,這會給我一個更平滑的趨勢線和一個信心絲帶,可以解釋有問題的一天。 但我知道這可能超出了這個問題的范圍,所以我只是將其添加為旁注; 如果有人想根據不同的建模提出解決方案,而不僅僅是圖形修正。 但我會感謝任何一個。
不想進入時間序列模型,您可以想象使用受限三次樣條轉換時間變量。
我需要更改您的一些代碼,這樣我就可以避免安裝某些軟件包的最新版本;-)。
請注意,我更改了一些變量名,因為date
是一個函數名,不應也用作變量名。
library(chron)
## added a numeric version of your date variable.
actual_df <- original_df %>%
filter(datez %in% lubridate::date("2020-09-10")) %>%
sample_n(size = 15) %>%
group_by(datez) %>%
ungroup %>%
bind_rows(original_df %>% filter(!datez %in% lubridate::date("2020-09-10"))) %>%
mutate(num_date = as.numeric(datez))
## How many knots across the dates do you want?
number_of_knots = 15
## This is to make sure that visreg is passed the actual knot locations! RMS::RCS does not store them in the model fits.
knots <- paste0("c(", paste0(attr(rms::rcs(actual_df$num_date, number_of_knots), "parms"), collapse = ", "), ")")
## We can construct the formula early.
formula <- as.formula(paste("score ~ rms::rcs(num_date,", knots,")"))
## fit the model as a gaussian glm and pass it to visreg for it's prediction function. This will give you predicted means and 95% CI for that mean. Then I convert the numeric dates back to real dates.
glm_rcs <- glm(data = actual_df, formula = formula, family = "gaussian") %>% visreg::visreg(plot = F) %>% .$fit %>%
mutate(date_date = chron::as.chron(num_date) %>% as.POSIXct())
## plot it!
ggplot(data = glm_rcs, aes(date_date,
y = visregFit)) +
geom_ribbon(aes(ymin = visregLwr, ymax = visregUpr), alpha = .5) +
geom_line()
編輯:您按天收集數據,但您可以向日期添加抖動,以便它們在一天內分散。
actual_df <- original_df %>%
filter(datez %in% lubridate::date("2020-09-10")) %>%
sample_n(size = 15) %>%
group_by(datez) %>%
ungroup %>%
bind_rows(original_df %>% filter(!datez %in% lubridate::date("2020-09-10"))) %>%
mutate(num_date = as.numeric(datez)) %>%
## Here we add random noise (uniform -.5 to .5) to each numeric date.
mutate(jittered_date = num_date + runif(n(), -.5, .5))
## You can lower this number to increase smoothing.
number_of_knots = 15
knots <- paste0("c(", paste0(attr(rms::rcs(actual_df$jittered_date, number_of_knots), "parms"), collapse = ", "), ")")
formula <- as.formula(paste("score ~ rms::rcs(jittered_date,", knots,")"))
glm_rcs <- glm(data = actual_df, formula = formula, family = "gaussian") %>% visreg::visreg(plot = F) %>% .$fit %>%
mutate(date_date = chron::as.chron(jittered_date) %>% as.POSIXct())
ggplot(data = glm_rcs, aes(date_date,
y = visregFit)) +
geom_ribbon(aes(ymin = visregLwr, ymax = visregUpr), alpha = .5) +
geom_line()
編輯2:
如果你有一個日期時間矢量,而不是一個簡單的一天點的抖動是不是必要的。 在您創建假數據的原始代碼中,您使用lubridate::date()
,它將您的 posix 日期時間向量lubridate::date()
為一個簡單的日期! 您可以通過以下方式避免這種情況:
original_df <- tibble(datez = seq(as.POSIXct('2020-09-01', tz = "UTC"), as.POSIXct('2020-09-15', tz = "UTC"), by="1 mins") %>%
sample(15000, replace = T)) %>%
mutate(datez_day = lubridate::date(datez)) %>%
add_column(score = runif(15000))
actual_df <- original_df %>%
filter(datez_day %in% lubridate::date("2020-09-10")) %>%
sample_n(size = 15) %>%
bind_rows(original_df %>% filter(!datez_day %in% lubridate::date("2020-09-10"))) %>%
mutate(num_date = as.numeric(datez))
現在你有datez_day
這是天價值, datez
這是一個日期,而num_date
這是日期時間的數值表示形式。
從那里您可以直接在num_date
上num_date
而無需添加任何抖動。
number_of_knots = 20
knots <- paste0("c(", paste0(attr(rms::rcs(actual_df$num_date, number_of_knots), "parms"), collapse = ", "), ")")
formula <- as.formula(paste("score ~ rms::rcs(num_date,", knots,")"))
glm_rcs <- glm(data = actual_df, formula = formula, family = "gaussian") %>%
visreg::visreg(plot = F) %>%
.$fit %>%
as_tibble() %>%
## Translate the num_date back into a datetime object so it is correct in the figures!
mutate(date_date = as.POSIXct.numeric(round(num_date), origin = "1970/01/01"))
ggplot(data = glm_rcs, aes(date_date,
y = visregFit)) +
geom_ribbon(aes(ymin = visregLwr, ymax = visregUpr), alpha = .5) +
geom_line()
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