Unconditional heteroskedasticity occurs when heteroskedasticity of the **error variance** is not correlated with the independent variables in the multiple regression.

**Can some one explain error variance?**

Unconditional heteroskedasticity occurs when heteroskedasticity of the **error variance** is not correlated with the independent variables in the multiple regression.

**Can some one explain error variance?**

You have a bunch of error terms: one for each observation. Some are big, some small, some positive, some negative.

The _ **error variance** _ is the *variance* of these *error terms*.

Dâ€™accord.