File size: 2,970 Bytes
57e83aa |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 |
n <- 20
b0 <- isolate(sample(-5:5, size=1))
b1 <- isolate(sample(-5:5, size=1))
x <- isolate(runif(n, min=-5, max=10))
y <- isolate(rnorm(n, mean=b0+b1*x, sd=5))
mod <- lm(y ~ x)
best_b0 <- round(coef(mod)[1], 2)
best_b1 <- round(coef(mod)[2], 2)
ssr <- sum((y-(best_b0+best_b1*x))^2)
ssr <- round(ssr, digits=2)
aux <- sum((y-(0+1*x))^2)
library(shiny)
# Define server logic required to draw a histogram
shinyServer(function(input, output) {
#Example
values <- reactiveValues(df_data = NULL)
values <- reactiveValues(df = data.frame(Intercepto=0,
Pendiente=1,
SCE=aux))
newEntry <- observeEvent(input$update,{
b0_new <- c(values$df$Intercepto, as.numeric(input$b0))
b1_new <- c(values$df$Pendiente, as.numeric(input$b1))
rta <- sum((y - (input$b0 + input$b1 * x))^2)
rta <- round(rta, digits=2)
SCE_new <- c(values$df$SCE, as.numeric(rta))
values$df <- data.frame(Intercepto = b0_new,
Pendiente = b1_new,
SCE = SCE_new)
})
output$example <- renderTable({values$df})
output$my_plot <- renderPlot({
par(mfrow=c(1, 2))
# Figura 1
plot(x=x, y=y,
#main=c(best_b0, best_b1),
main="Diagrama de dispersion y \n modelo ajustado",
pch=19, las=1)
abline(h=0, v=0, lty="dashed", col=gray(0.8))
aux <- function(inter, slope) inter + slope * x
y_hat <- aux(inter = tail(values$df$Intercepto, n=1),
slope = tail(values$df$Pendiente, n=1))
#abline(a=input$b0, b=input$b1, lwd=3, col="deepskyblue3")
abline(a=tail(values$df$Intercepto, n=1),
b=tail(values$df$Pendiente, n=1),
lwd=3, col="deepskyblue3")
segments(x0=x, y0=y, x1 =x, y1=y_hat, col="tomato", lty="dotted")
# If correct
if (min(values$df$SCE) == ssr)
legend("center","center",
paste0(input$nombre, "\n felicitaciones, \n lo hiciste bien!!! "),
text.col="darkorchid3", cex=2, bty="n", bg="#ffffff00")
# Figura 2
with(values$df, plot(SCE, las=1, type='b', pch=19,
ylab="SCE",
xlab="Intento",
ylim=c(0, max(SCE)),
main="Evolucion de SCE"))
text(x=1, y=ssr,
paste0("Obj=", ssr),
col="green4", pos=4)
abline(h=ssr, col="green4", lty="dashed", lwd=2)
# If correct
if (min(values$df$SCE) == ssr)
legend("center","center",
paste0(input$nombre, "\n felicitaciones, \n lo hiciste bien!!! "),
text.col="darkorchid3", cex=2, bty="n", bg="#ffffff00")
})
})
|