dt(x, df) pt(q, df) qt(p, df) rt(n, df)
df
degrees of freedom. dt
gives the density, pt
gives the distribution function, qt
gives the quantile function
and rt
generates random deviates.
The t distribution with n degrees of freedom has density
f(x) = Gamma((n+1)/2) / (sqrt(n pi) Gamma(n/2)) (1 + x^2/n)^-((n+1)/2)
for all real x.df
for the F distribution which generalizes the t one.
1 - pt(1:5, df = 1) qt(.975, df = c(1:10,20,50,100,1000))