Evaluate the probability mass function of a chi square distribution

Usage

# S3 method for class 'ChiSquare'
pdf(d, x, drop = TRUE, elementwise = NULL, ...)

# S3 method for class 'ChiSquare'
log_pdf(d, x, drop = TRUE, elementwise = NULL, ...)

Arguments

d: A ChiSquare object created by a call to ChiSquare().
x: A vector of elements whose probabilities you would like to determine given the distribution d.
drop: logical. Should the result be simplified to a vector if possible?
elementwise: logical. Should each distribution in d be evaluated at all elements of x (elementwise = FALSE, yielding a matrix)? Or, if d and x have the same length, should the evaluation be done element by element (elementwise = TRUE, yielding a vector)? The default of NULL means that elementwise = TRUE is used if the lengths match and otherwise elementwise = FALSE is used.
...: Arguments to be passed to dchisq. Unevaluated arguments will generate a warning to catch mispellings or other possible errors.

Value

In case of a single distribution object, either a numeric vector of length probs (if drop = TRUE, default) or a matrix with length(x) columns (if drop = FALSE). In case of a vectorized distribution object, a matrix with length(x) columns containing all possible combinations.

Examples


set.seed(27)

X <- ChiSquare(5)
X
#> [1] "ChiSquare(df = 5)"

mean(X)
#> [1] 5
variance(X)
#> [1] 10
skewness(X)
#> [1] 1.264911
kurtosis(X)
#> [1] 2.4

random(X, 10)
#>  [1] 11.2129049  7.8935724  2.1298341  5.2084236  5.4563211  3.6636712
#>  [7] 10.9823299  0.7858347  4.8748588  1.7938110

pdf(X, 2)
#> [1] 0.1383692
log_pdf(X, 2)
#> [1] -1.97783

cdf(X, 4)
#> [1] 0.450584
quantile(X, 0.7)
#> [1] 6.06443

cdf(X, quantile(X, 0.7))
#> [1] 0.7
quantile(X, cdf(X, 7))
#> [1] 7