[SOLVED] CS代考程序代写 #Central and non-central chi-squared distributions.

#Central and non-central chi-squared distributions.
#Central chi-squared dist:
x <- seq(0, 20, .15)y <- dchisq(x, df=5, ncp=0)plot(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2,ylab=substitute(f(x)))#Non-central chi-squared dist:x <- seq(0, 20, .15)y <- dchisq(x, df=5, ncp=3)points(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2, col=”blue”,ylab=substitute(f(x)))#=================================================#=================================================#Central and non-central t distributions.#Central t dist:x <- seq(-10, 10, .05)y <- dt(x,4,, ncp=0)plot(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2,ylab=substitute(f(x)), xlim=c(-20,20))#Non-central t dist:x <- seq(-16, 20, .1)y <- dt(x, 4, ncp=2)points(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2, col=”blue”,ylab=substitute(f(x)))#=================================================#=================================================#Central and non-central F distributions.#Central F dist:x <- seq(0, 10, .05)y <- df(x, df1=3,df2=5, ncp=0)plot(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2,ylab=substitute(f(x)))#Non-central F dist:x <- seq(0, 10, .1)y <- df(x, df1=3,df2=5, ncp=3)points(x, y, xaxt=”n”, yaxt=”n”, type=”l”, lwd=2, col=”blue”,ylab=substitute(f(x)))