Anxiety can often make these related conditions worse, so talk with a mental health care professional if anxiety begins to interfere on a daily basis.
In probability theory and statistics, the variance of a random variable is a measure of its statistical dispersion, indicating how far from the expected value its values typically are. The variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant.
What is variance analysis? In accounting, a variance is the difference between an expected or planned amount and an actual amount. For example, a variance can occur for items contained in a department's expense report. Variance analysis attempts to identify and explain the reasons for the difference between a budgeted amount and an actual amount. Variance analysis is usually associated with a manufacturer's product costs.