udchisq | R Documentation |
Create UNU.RAN object for a Chi-squared (chi^2)
distribution with df
degrees of freedom.
[Distribution] – Chi-squared.
udchisq(df, lb=0, ub=Inf)
df |
degrees of freedom (strictly positive). Non-integer values allowed. |
lb |
lower bound of (truncated) distribution. |
ub |
upper bound of (truncated) distribution. |
The Chi-squared distribution with df
= n > 0 degrees of
freedom has density
f_n(x) = 1 / (2^(n/2) Gamma(n/2)) x^(n/2-1) e^(-x/2)
for x > 0.
The domain of the distribution can be truncated to the
interval (lb
,ub
).
An object of class "unuran.cont"
.
Josef Leydold and Wolfgang H\"ormann unuran@statmath.wu.ac.at.
N.L. Johnson, S. Kotz, and N. Balakrishnan (1994): Continuous Univariate Distributions, Volume 1. 2nd edition, John Wiley & Sons, Inc., New York. Chap. 18, p. 416
unuran.cont
.
## Create distribution object for chi-squared distribution distr <- udchisq(df=5) ## Generate generator object; use method PINV (inversion) gen <- pinvd.new(distr) ## Draw a sample of size 100 x <- ur(gen,100)
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