Variance

The standard deviation is a measure of how much a dataset differs from its mean; it tells us how dispersed the data are. A dataset that’s pretty much clumped around a single point would have a small standard deviation, while a dataset that’s all over the map would have a large standard deviation. Given a … Read more

Welford’s method for computing variance (published here : Variance – Welford’s Method) is using single pass method for calculation, but it is still using a loop. This method is avoiding loops after initial values are set up and that makes it much faster and suitable for usage where speed of execution is a must. PS: … Read more