Definitions for **"Heteroscedasticity"**

A scatter-plot or residual plot shows heteroscedasticity if the scatter in vertical slices through the plot depends on where you take the slice. Linear regression is not usually a good idea if the data are heteroscedastic.

Time-varying, or time-dependent, variance.

The absence of homogeneity of variance. See HOMOGENEITY OF VARIANCE.

Non-constant volatility.