what is the model heteroskedasticity why is heteroskedasticity a problem of regression? does nonlinear regression contain heteroskedastic residuals? what is a nonlinear model of heteroskedasticity what type of data is used in nonlinear regression why do residuals need correlation in linear regression which model describes heteroskedasticity and correlated residuals what is the difference between heteroskedasticity and serial correlation why do residuals of a nonlinear model have a sinusoidal pattern? what is residual heteroskedasticity is residual correlated with non constant variance why are residual values correlated what does correlated residuals mean in regression what is the difference between heteroskedasticity and linear regression when a residual is growing in time, what means it is correlated with non constant variance in regression? is hyperskedasticity a linear problem what is heteroskedasticity in regression heteroskedastic residuals what residual are in nonlinear regression is heteroskedasticity a linear regression problem