Create a JavaScript function to calculate a 2-tailed t distribution by adapting an already existing method

Can someone help me with implementing a two-tailed t-test in JavaScript?

Resource: Student's t distribution in JavaScript for Google Spreadsheet

I have taken a potential solution from the link and customized it to function outside of the form:

function LogGamma(Z) {
    ...
}

function Betinc(X,A,B) {
    ...
}

function tdist(X, df) {
    ...
}

It seems like this code doesn't perform as a two-tailed test. Any suggestions on how to modify it for that purpose?

Answer №1

result = 1 - t_distribution(X, df)

To calculate the two-tailed probability, simply multiply the one-tailed probability by 2.

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