R Shiny：顯示箱線圖（使用 ggplot）顯示沒有正確的箱線圖

Question

我正在嘗試使用 ggplot 和 geom_boxplot 來顯示和分組箱線圖。 該代碼沒有顯示錯誤並顯示圖表，但顯示正確的箱線圖時出現問題。 如您所見，沒有箱線圖，但對於所選變量的每個類別都有一條線。 我想要的是這樣的 output：

使用的變量保存為 data.frames。 你知道如何修復箱線圖 output 嗎？

我的代碼：

library(shiny)
library(shinydashboard)
library(dplyr)
library(DT)
library(ggplot2)
library(likert)



levels.netusoft <- c("Sehr wenig", "Etwas", "Stark", "Sehr stark", "Verweigert", 
                     "Weiß nicht", "Keine Antwort")
levels.ppltrst <- c("1", "2", "3", "4", "5", "6", "Verweigert", "Weiß nicht", 
                    "Keine Antwort")
levels.polintr <- c("Überhaupt nicht", "Sehr wenig", "Etwas", "Stark", "Sehr stark", 
                    "Verweigert", "Weiß nicht", "Keine Antwort")
levels.psppsgva <- c("Überhaupt nicht fähig", "Wenig fähig", "Ziemlich fähig", 
                     "Sehr fähig", "Vollkommen fähig", "Verweigert", "Weiß nicht", 
                     "Keine Antwort")
levels.actrolga <- c("Wenig fähig", "Ziemlich fähig", "Sehr fähig", "Vollkommen fähig", 
                     "Verweigert", "Weiß nicht", "Keine Antwort")
levels.gndr <- c("männlich", "weiblich")

dataset <- data.frame("netusoft" = factor(sample(levels.netusoft, 100, 
                                                 replace = TRUE),
                                          levels.netusoft),
                      "ppltrst" = factor(sample(levels.ppltrst, 100, 
                                                replace = TRUE),
                                         levels.ppltrst),
                      "polintr" = factor(sample(levels.polintr, 100, 
                                                replace = TRUE),
                                         levels.polintr),
                      "psppsgva" = factor(sample(levels.psppsgva, 100, 
                                                 replace = TRUE),
                                          levels.psppsgva),
                      "actrolga" = factor(sample(levels.actrolga, 100, 
                                                 replace = TRUE),
                                          levels.actrolga),
                      "gndr" = factor(sample(levels.gndr, 100,
                                             replace = TRUE),
                                      levels.gndr),
                      check.names = FALSE)



# ----- UI
ui <- fluidPage(
  dashboardPage(
    dashboardHeader(title = "Test Shiny Dashboard", 
                    titleWidth = 300),
    dashboardSidebar(width = 300,
                     selectInput(inputId = "round", 
                                 label = "Wählen Sie eine Runde aus",  
                                 c("Runde 9" = "9"),
                                 selected = "9", selectize = FALSE), 
                     #end selectinput
                     conditionalPanel(
                       condition = "input.round == '9'",
                       selectInput(inputId = "battery", 
                                   label = "Wählen Sie Themenfeld aus",
                                   c("A: Medien-, Internetnutzung, Soziales Vertrauen" = "A",
                                     "B: Politische Variablen, Immigration" = "B"), 
                                   selectize = FALSE), #end selectinput
                       uiOutput("question_placeholder")
                     ),
                     checkboxInput(
                       inputId = "group",
                       label = "Daten gruppieren",
                       value = FALSE), #end checkbox
                     
                     conditionalPanel(
                       condition = "input.group == true",
                       selectInput(
                         inputId = "UV",
                         label = "Daten gruppieren nach:",
                         c("Geschlecht" = "gndr")
                       ) # end conditionalPanel
                     )
    ), # end dashboardSidebar
    dashboardBody(
      fluidRow(
        
        box(width = 8, status = "info", solidHeader = TRUE,
            title = "Graph:",
            plotOutput("plot", width = "auto", height = 500)
        )
      ), # end fluidRow
      
    
      
    ) #end dashboardBody
  )
)

server <- function(input, output, session) {
  get_data <- reactive({
    req(input$question)
    if (input$group) {
      dataset %>% 
        select(Antwortkategorie = input$question, req(input$UV)) %>% 
        group_by(grp = !!as.symbol(input$UV), Antwortkategorie)
    } else {
      dataset %>% 
        select(Antwortkategorie = input$question) %>% 
        group_by(Antwortkategorie)
    } 
  })
 

  
  output$question_placeholder <- renderUI({
    if (input$battery == "A") {
      choices <- c("A2|Häufigkeit Internetnutzung" = "netusoft",
                   "A4|Vertrauen in Mitmenschen" = "ppltrst")
    } else if (input$battery == "B") {
      choices <- c("B1|Interesse an Politik" = "polintr",
                   "B2|Politische Mitsprachemöglichkeit" = "psppsgva",
                   "B3|Fähigkeit politischen Engagements " = "actrolga")
    }
    selectInput(inputId = "question", 
                label = "Wählen Sie eine Frage aus",
                choices,
                selectize = FALSE)
  })
  


  theplot <- reactive({

      p <- get_data() %>%
        ggplot(mapping = aes(y = (Antwortkategorie))) + 
        geom_boxplot()
      
    
    if(input$group==TRUE) {
      p <- get_data() %>%
        ggplot(mapping = aes(x=grp, 
                             y=Antwortkategorie)) + 
        geom_boxplot()
      
      
    }
    
    plot(p)
    
  })
  
  
  output$plot <- renderPlot({
    theplot()
    
  })
  

}

shinyApp(ui, server)

Answer 1

更新

您的數據需要重新編碼為數字。 如果您使用此示例數據框，您的代碼可以工作，並且您可以顯示每個變量的箱線圖。

dataset <- data.frame("netusoft" = sample(c(1:4), 100, 
                                                 replace = TRUE),
                      "ppltrst" = sample(c(1:6), 100, 
                                         replace = TRUE),
                      "polintr" = sample(c(1:5), 100, 
                                         replace = TRUE),
                      "psppsgva" = sample(c(1:5), 100, 
                                          replace = TRUE),
                      "actrolga" = sample(c(1:4), 100, 
                                          replace = TRUE),
                      "gndr" = factor(sample(c("männlich", "weiblich"), 100,
                                             replace = TRUE)),
                      check.names = FALSE)

初步答案

您忘記為geom_boxplot()計算框所需的 x 軸定義美學。

theplot <- reactive({

  p <- get_data() %>%
    ggplot(mapping = aes(x = "your_data_here", = (Antwortkategorie))) + 
    geom_boxplot()
  

此外，您錯誤地定義了分組變量。 在你的 if 語句中。 如果要按組繪制箱線圖，則必須在aes()中使用group =參數。

if(input$group==TRUE) {
  p <- get_data() %>%
    ggplot(mapping = aes(x="your_data_here", 
                         y=Antwortkategorie,
                         group=grp)) + 
    geom_boxplot()
  
  
}

plot(p)
})