Description Usage Arguments Details Value Author(s) References See Also Examples
Density, distribution function, quantile function and random
generation for the chi distribution with df
degrees of
freedom.
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x,q 
vector of quantiles. 
p 
vector of probabilities. 
n 
number of observations. If 
df 
degrees of freedom (nonnegative, but can be noninteger). 
lower.tail 
logical; if TRUE (default), probabilities are P[X <= x], otherwise, P[X > x]. 
... 
additional arguments to be passed to the function

The chi distribution with df
= n > 0 degrees of freedom
has density
f_n (x) = 2^(1n/2) x^(n1) e^((x^2)/2) / Gamma(n/2)
for x > 0. This distribution is used to describe the square root of a variable distributed according to a chisquare distribution.
dchi
gives the density, pchisq
gives the distribution
function, qchisq
gives the quantile function, and rchisq
generates random deviates.
Clement Calenge clement.calenge@oncfs.gouv.fr
Evans, M., Hastings, N. and Peacock, B. (2000) Statistical Distributions, 3rd ed. Wiley, New York.
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