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n <- 20 |
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b0 <- isolate(sample(-5:5, size=1)) |
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b1 <- isolate(sample(-5:5, size=1)) |
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x <- isolate(runif(n, min=-5, max=10)) |
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y <- isolate(rnorm(n, mean=b0+b1*x, sd=5)) |
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mod <- lm(y ~ x) |
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best_b0 <- round(coef(mod)[1], 2) |
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best_b1 <- round(coef(mod)[2], 2) |
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ssr <- sum((y-(best_b0+best_b1*x))^2) |
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ssr <- round(ssr, digits=2) |
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aux <- sum((y-(0+1*x))^2) |
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library(shiny) |
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shinyServer(function(input, output) { |
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values <- reactiveValues(df_data = NULL) |
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values <- reactiveValues(df = data.frame(Intercepto=0, |
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Pendiente=1, |
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SCE=aux)) |
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newEntry <- observeEvent(input$update,{ |
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b0_new <- c(values$df$Intercepto, as.numeric(input$b0)) |
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b1_new <- c(values$df$Pendiente, as.numeric(input$b1)) |
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rta <- sum((y - (input$b0 + input$b1 * x))^2) |
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rta <- round(rta, digits=2) |
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SCE_new <- c(values$df$SCE, as.numeric(rta)) |
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values$df <- data.frame(Intercepto = b0_new, |
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Pendiente = b1_new, |
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SCE = SCE_new) |
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}) |
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output$example <- renderTable({values$df}) |
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output$my_plot <- renderPlot({ |
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par(mfrow=c(1, 2)) |
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plot(x=x, y=y, |
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main="Diagrama de dispersion y \n modelo ajustado", |
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pch=19, las=1) |
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abline(h=0, v=0, lty="dashed", col=gray(0.8)) |
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aux <- function(inter, slope) inter + slope * x |
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y_hat <- aux(inter = tail(values$df$Intercepto, n=1), |
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slope = tail(values$df$Pendiente, n=1)) |
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abline(a=tail(values$df$Intercepto, n=1), |
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b=tail(values$df$Pendiente, n=1), |
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lwd=3, col="deepskyblue3") |
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segments(x0=x, y0=y, x1 =x, y1=y_hat, col="tomato", lty="dotted") |
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if (min(values$df$SCE) == ssr) |
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legend("center","center", |
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paste0(input$nombre, "\n felicitaciones, \n lo hiciste bien!!! "), |
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text.col="darkorchid3", cex=2, bty="n", bg="#ffffff00") |
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with(values$df, plot(SCE, las=1, type='b', pch=19, |
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ylab="SCE", |
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xlab="Intento", |
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ylim=c(0, max(SCE)), |
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main="Evolucion de SCE")) |
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text(x=1, y=ssr, |
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paste0("Obj=", ssr), |
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col="green4", pos=4) |
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abline(h=ssr, col="green4", lty="dashed", lwd=2) |
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if (min(values$df$SCE) == ssr) |
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legend("center","center", |
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paste0(input$nombre, "\n felicitaciones, \n lo hiciste bien!!! "), |
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text.col="darkorchid3", cex=2, bty="n", bg="#ffffff00") |
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}) |
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}) |
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