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# Distribución Chi-cuadrado

gl=12
n=10000

x=rchisq(n,gl)
hist(x,freq=FALSE,breaks=50,ylim=c(0,0.15),main="Distribución Chi-cuadrado")

xx=seq(0,35,0.1)
lines(xx,dchisq(xx,gl))

alfa=0.05
d=qchisq(1-alfa,gl)

cat("d=",d,"\n")

## d= 21.02607

abline(v=d)

p=pchisq(d,gl)

cat("p=",p)

## p= 0.95