u = chi2rnd(nu, [N,1]);

Hi,

I use the chi2rnd to generate random variables. This function asks me as an input the degrees of freedom, but I do not know how it is calculated. If someone could help me with this, be grateful. For example, in this case "u = chi2rnd (nu, [N, 1])", what are the degrees of freedom nu?

Answer 1

[Daniel Shub]

The degrees of freedom is a parameter of the distribution. Basically, you can rewrite chi2rnd as:

chi2rnd = @(nu, siz)sum(randn([nu, siz]).^2);

Basically, the degrees of freedom nu is how many normal random variables you are going to sum together. Its value really depends on your application.