R 具有 NA 寬度的 Plotly 抖動箱線圖

Question

我正在使用以下函數繪制帶有抖動的分組箱線圖：

plot_boxplot <- function(dat) {
  # taking one of each joine_group to be able to plot it
  allx <- dat %>% 
    mutate(y = median(y, na.rm = TRUE)) %>%
    group_by(joined_group) %>% 
    sample_n(1) %>% 
    ungroup()

  p <- dat %>%
    plotly::plot_ly() %>%
    # plotting all the groups 1:20
    plotly::add_trace(data = allx, 
                      x = ~as.numeric(joined_group),
                      y = ~y,
                      type = "box",
                      hoverinfo = "none",
                      boxpoints = FALSE,
                      color = NULL,
                      opacity = 0,
                      showlegend = FALSE) %>% 
    # plotting the boxes
    plotly::add_trace(data = dat, 
                      x = ~as.numeric(joined_group),
                      y = ~y,
                      color = ~group1,
                      type = "box",
                      hoverinfo = "none",
                      boxpoints = FALSE,
                      showlegend = FALSE) %>% 
    # adding ticktext
    layout(xaxis = list(tickvals = 1:20,
                        ticktext = rep(levels(dat$group1), each = 4)))

  p <- p %>%
    # adding jittering
    add_markers(data = dat,
                x = ~jitter(as.numeric(joined_group), amount = 0.2),
                y = ~y,
                color = ~group1,
                showlegend = FALSE)
  p

}

問題是，當某些級別的NA作為y變量時，抖動框的寬度會發生變化。 下面是一個例子：

library(plotly)
library(dplyr)
set.seed(123)
dat <- data.frame(group1 = factor(sample(letters[1:5], 100, replace = TRUE)),
                  group2 = factor(sample(LETTERS[21:24], 100, replace = TRUE)),
                  y = runif(100)) %>% 
  dplyr::mutate(joined_group = factor(
    paste0(group1, "-", group2)
  ))

# do the plot with all the levels
p1 <- plot_boxplot(dat)

# now the group1 e is having NAs as y values
dat$y[dat$group1 == "e"] <- NA

# create the plot with missing data
p2 <- plot_boxplot(dat)

# creating the subplot to see that the width has changed:
subplot(p1, p2, nrows = 2)

問題是兩個圖中框的寬度不同：

我已經意識到盒子具有相同的大小而沒有抖動，所以我知道抖動與寬度“混亂”，但我不知道如何解決這個問題。

有誰知道如何使兩個抖動圖中的寬度完全相同？

Answer 1

我看到兩個單獨的情節轉變：

1. 由於抖動
2. 由於 NA

首先可以通過使用固定種子聲明新的抖動函數來解決

fixed_jitter <- function (x, factor = 1, amount = NULL) {
  set.seed(42)
  jitter(x, factor, amount)
}

並在add_markers調用中使用它而不是jitter 。

第二個問題可以通過分配 -1 而不是 NA 並設置來解決

yaxis = list(range = c(0, ~max(1.1 * y)))

作為layout的第二個參數。