| avm99963 | a3a1419 | 2021-02-11 10:53:22 +0100 | [diff] [blame^] | 1 | # == COMPARANT FUNCIONS TEÒRIQUES I EMPÍRIQUES == |
| 2 | y = rnorm(100) |
| 3 | |
| 4 | # Densitats de probabilitat |
| 5 | hist(y, freq=F) # freq=F fa que la suma sigui 1 (si no passarà que serà la suma |
| 6 | # de freqüències) |
| 7 | curve(dnorm(x), add=T) |
| 8 | curve(dnorm(x, 0, 1.2), col="red", add=T) |
| 9 | curve(dnorm(x, 0.1, 1), col="blue", add=T) |
| 10 | |
| 11 | # Funcions de probabilitat acumulada |
| 12 | plot(sort(y), (1:100)/100, type="S") |
| 13 | curve(pnorm(x), add=T) |
| 14 | curve(pnorm(x, 0.1, 1), col="red", add=T) |
| 15 | |
| 16 | z = matrix(y, nrow=10, ncol=10) |
| 17 | z |
| 18 | |
| 19 | # == DATA FRAMES == |
| 20 | x = rexp(100) |
| 21 | x |
| 22 | d=data.frame(x, y) |
| 23 | head(d) |
| 24 | d$x |
| 25 | d$y |
| 26 | d[1,] |
| 27 | d[,1] |
| 28 | d[,2] |
| 29 | |
| 30 | dd = data.frame(x, y, z) |
| 31 | dd$z |
| 32 | head(dd) |