Upload 2 files

server.R

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+shinyServer(function(input, output) {
+  
+  output$k <- renderUI({
+    sliderInput(inputId = "k", 
+                label = HTML("Number of units sampled from the population:"), 
+                min=1,
+                max=input$m+input$n, 
+                value=1,
+                step= 1)
+  })
+  
+  output$grafico1 <- renderPlot({
+    min_x <- max(c(0, input$k-input$n))
+    max_x <- min(c(input$k, input$m))
+    prob <- dhyper(x=min_x:max_x, m=input$m, n=input$n, k=input$k)
+    barplot(prob, ylim=c(0, 1), names.arg=min_x:max_x,
+            xlab="X: number of successes observed in the sample", 
+            ylab=expression(P(X==x)), 
+            col="deepskyblue3", las=1)
+    grid()
+  })
+  
+  output$med_var <- renderText({
+    p <- input$m / (input$m + input$n)
+    esperanza <- input$k * p
+    varianza <- input$k * p * (1-p) * (input$m+input$n-input$k) / (input$m+input$n-1)
+    paste(c("For this configuration E(X) =", round(esperanza, 2),
+            "and Var(X) =", round(varianza, 2)))
+  })
+  
+})

ui.R

@@ -0,0 +1,42 @@
+library(shiny)
+
+# Define UI for application that draws a histogram
+shinyUI(fluidPage(
+
+  # Application title
+  titlePanel("Hypergeometric distribution"),
+
+  # Sidebar with a slider input for the number of bins
+  sidebarLayout(
+    sidebarPanel(
+      p("Modify the parameter values and observe what happens in the barplot"),
+      br(),
+      br(),
+      sliderInput(inputId = "m",
+                  label = HTML("Number of successes in the population:"),
+                  min = 1,
+                  max = 50,
+                  value = 6,
+                  step= 1,
+                  animate = TRUE),
+      sliderInput(inputId = "n",
+                  label = HTML("Number of failures in the population:"),
+                  min = 1,
+                  max = 50,
+                  value = 4,
+                  step= 1,
+                  animate = TRUE),
+      uiOutput("k"),
+      br(),
+      p("App created by Semillero de R at Universidad Nacional de Colombia:"),
+      tags$a(href="https://srunal.github.io/", "https://srunal.github.io/")
+    ),
+
+    # Show a plot of the generated distribution
+    mainPanel(
+      h3("Probability distribution", align = "center"),
+      plotOutput("grafico1"),
+      verbatimTextOutput('med_var')
+    )
+  )
+))