R, Python 분석과 프로그래밍의 친구 (by R Friend)

#------------------------------------------------------------------ 
# Summary Statistics of a Continuous Variable using RShiny 
#------------------------------------------------------------------

library(shiny)

# Define UI for application that calculate summary statistics
ui <- fluidPage(
   
   # Application title
   titlePanel("Descriptive Statistics of Automobiles"),
   
   # select Input from lists 
   sidebarPanel(
     selectInput("var", "Select a Variable to Analyze", 
                 choice = c("Price"=1, 
                            "MPG.city"=2, 
                            "MPG.highway"=3, 
                            "EngineSize"=4, 
                            "Horsepower"=5, 
                            "RPM"=6), 
                 selectize = F), 
     
     checkboxGroupInput("checked", "Check summary statistics", 
                        list(mean = "mean", 
                             std_dev = "std_dev", 
                             median = "median", 
                             min = "min", 
                             max = "max", 
                             obs_num = "obs_num", 
                             quartile_1 = "quartile_1", 
                             quartile_3 = "quartile_3"), 
                        selected = "mean")
   ), 
   mainPanel(
     h4("Summary Statistics of a variable"),
     tableOutput("desc_statistics")
   )
)

# Define server logic required to calculate summary statistics
server <- function(input, output) {
  # read dataset
  library(MASS)
  descriptive <- Cars93[,c("Price", "MPG.city", "MPG.highway", "EngineSize", "Horsepower", "RPM")]

  output$desc_statistics <- renderTable({
    # summary statistics
    variable <- colnames(descriptive)[as.numeric(input$var)]
    mean <- mean(descriptive[, as.numeric(input$var)], na.rm=TRUE)
    std_dev <- sd(descriptive[, as.numeric(input$var)], na.rm=TRUE)
    median <- median(descriptive[, as.numeric(input$var)], na.rm=TRUE)
    min <- min(descriptive[, as.numeric(input$var)], na.rm=TRUE)
    max <- max(descriptive[, as.numeric(input$var)], na.rm=TRUE)
    obs_num <- nrow(descriptive)
    quartile_1 <- quantile(descriptive[, as.numeric(input$var)], 0.25, na.rm=TRUE)
    quartile_3 <- quantile(descriptive[, as.numeric(input$var)], 0.75, na.rm=TRUE)
    
    # make a DataFrame
    desc_summary <- data.frame(variable, 
                               mean, std_dev, 
                               median, min, max, 
                               obs_num, 
                               quartile_1, quartile_3)
    
    # render Table
    desc_summary[, c("variable", input$checked), drop = FALSE]
  })
}

# Run the application 
shinyApp(ui = ui, server = server)