Answer to Question #232639 in Economics for KAT

Question

What do you understand by Heteroskedasticity? What are the approaches for remedial measures of Heteroskedasticity?

Answer 1

In statistics, heteroskedasticity (or heteroscedasticity) happens when the standard deviations of a predicted variable, monitored over different values of an independent variable or as related to prior time periods, are non-constant. With heteroskedasticity, the tell-tale sign upon visual inspection of the residual errors is that they will tend to fan out over time.

There are three primary ways to test for heteroskedasticity. You can check it visually for cone-shaped data, use the simple Breusch-Pagan test for normally distributed data, or you can use the White test as a general model.