Hedges’ g Calculator is an online tool that can be used to calculate the effect size of a given set of data. It is based on the Hedges’ g formula, which is a measure of the magnitude of a treatment effect in a meta-analysis. Hedges’ g is a standardized measure of the effect size, which allows researchers to compare the effects of different treatments across studies. The calculator allows users to easily calculate the effect size for a given set of data.
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Hedges’ g: 0.296451
function calc() {
//get input values
var x1 = +document.getElementById(‘x1’).value;
var s1 = +document.getElementById(‘s1’).value;
var n1 = +document.getElementById(‘n1’).value;
var x2 = +document.getElementById(‘x2’).value;
var s2 = +document.getElementById(‘s2’).value;
var n2 = +document.getElementById(‘n2’).value;
//calculate stuff
var diff = Math.abs(x1-x2);
var pool = Math.sqrt(((n1-1)*s1*s1 – (-1*((n2-1)*s2*s2)))/(n1-(-1*n2)-2));
var g = diff/pool;
//output probabilities
document.getElementById(‘g’).innerHTML = g.toFixed(6);
}