| # == COMPARANT FUNCIONS TEÒRIQUES I EMPÍRIQUES == |
| y = rnorm(100) |
| |
| # Densitats de probabilitat |
| hist(y, freq=F) # freq=F fa que la suma sigui 1 (si no passarà que serà la suma |
| # de freqüències) |
| curve(dnorm(x), add=T) |
| curve(dnorm(x, 0, 1.2), col="red", add=T) |
| curve(dnorm(x, 0.1, 1), col="blue", add=T) |
| |
| # Funcions de probabilitat acumulada |
| plot(sort(y), (1:100)/100, type="S") |
| curve(pnorm(x), add=T) |
| curve(pnorm(x, 0.1, 1), col="red", add=T) |
| |
| z = matrix(y, nrow=10, ncol=10) |
| z |
| |
| # == DATA FRAMES == |
| x = rexp(100) |
| x |
| d=data.frame(x, y) |
| head(d) |
| d$x |
| d$y |
| d[1,] |
| d[,1] |
| d[,2] |
| |
| dd = data.frame(x, y, z) |
| dd$z |
| head(dd) |