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chisq

Chi-squared Distribution

Syntax

y = chisq(n,x,c)

Parameters

y:

output

n:

degrees of freedom

x:

x is real number lying within the range 0 to +infinity for cdf and pdf computation. while for inverse cdf x will represent P and Q and its value will lie between 0 and 1.

c = 1:

It will allow the user to generate chi-squared random variate with n degrees of freedom. In this case the function is independent of x and hence any value of x can be set.

c = 2:

It will allow the user to compute the probability density p(x) at x for chi-squared distribution with n degrees of freedom.

c = 3:

It will allow the user to compute chi-squared cdf P(x)

c = 4:

It will allow the user to compute chi-squared cdf Q(x).

c = 5:

It will allow the user to compute inverse chi-squared cdf P(x).

c >=6:

It will allow the user to compute inverse chi-squared cdf Q(x).

Description

This function is used to calculate chi-squared random variate, probability density, cumulative distribution functions P(x), Q(x) and their inverse.

Examples

// probability density p(x) at x=1 for chi-squared distribution with degrees of freedom n=1.
n=1
x=1
c=2
y = chisq(n,x,c)
disp(y)

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