# Difference between MSE and variance

In statistics, sometimes we use mean sum of error, and sometimes variance. I just want to know what is the difference between mean sum of error and variance?

• "MSE" stands for Mean Squared Error, not "mean sum of error." – gung Aug 8 '15 at 17:08

$MSE = {\rm variance} + {\rm bias}^2$. As per gung, MSE is mean squared error.