Anxiety disorders can be seen with other mental health conditions, such as: 1  Depression. 2  Substance abuse. 3  ADHD. 4  Eating disorders. 5  Trouble sleeping.
A variance has several meanings in business. In an accounting sense, a variance is the difference between an actual amount and a pre-determined standard amount or the amount budgeted. In a statistical sense, a variance is a measure of the amount of spread in a distribution.
The variance is a measure of the variability of dispersion of the data. It is given by calculating and squaring the differences between the values and the mean, and calculating the average (mean) of those values. - How far, on average, each observation is from the mean.