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export default function variance(values, valueof) {
let count = 0;
let delta;
let mean = 0;
let sum = 0;
if (valueof === undefined) {
for (let value of values) {
if (value != null && (value = +value) >= value) {
delta = value - mean;
mean += delta / ++count;
sum += delta * (value - mean);
}
}
} else {
let index = -1;
for (let value of values) {
if ((value = valueof(value, ++index, values)) != null && (value = +value) >= value) {
delta = value - mean;
mean += delta / ++count;
sum += delta * (value - mean);
}
}
}
if (count > 1) return sum / (count - 1);
}