how to choose number of lags in arch when to do the correct number of lags in ark how to choose number of lags in arch test arch lm test how to choose lag how to choose lags in arch tests which number of lags in arch model is the proper one for an arch model how to choose number of lags in arch model how to select lags in arch what is the correct number of lags in archtest how to choose number of lags in an arch test which arch test results in homoscedastic time series what is correct number of lags in arc test? how to check the intervals between lags in arch test. how to choose number of lags in arch models using arch lm test? how to select number of lags in r test how many lags in arch which test is correct for number of lags in arch model? what is lag value of arch test for lm ach p value definition arch lag number