Examples for 'stats::TDist'

The Student t Distribution

Aliases: TDist dt pt qt rt

Keywords: distribution

### ** Examples

require(graphics)

1 - pt(1:5, df = 1)

[1] 0.25000000 0.14758362 0.10241638 0.07797913 0.06283296

qt(.975, df = c(1:10,20,50,100,1000))

 [1] 12.706205  4.302653  3.182446  2.776445  2.570582  2.446912  2.364624
 [8]  2.306004  2.262157  2.228139  2.085963  2.008559  1.983972  1.962339

tt <- seq(0, 10, length.out = 21)
ncp <- seq(0, 6, length.out = 31)
ptn <- outer(tt, ncp, function(t, d) pt(t, df = 3, ncp = d))
t.tit <- "Non-central t - Probabilities"
image(tt, ncp, ptn, zlim = c(0,1), main = t.tit)
plot of chunk example-stats-TDist-1
persp(tt, ncp, ptn, zlim = 0:1, r = 2, phi = 20, theta = 200, main = t.tit,
      xlab = "t", ylab = "non-centrality parameter",
      zlab = "Pr(T <= t)")
plot of chunk example-stats-TDist-1
plot(function(x) dt(x, df = 3, ncp = 2), -3, 11, ylim = c(0, 0.32),
     main = "Non-central t - Density", yaxs = "i")
plot of chunk example-stats-TDist-1
[Package stats version 4.2.3 Index]