能否举例说明一下？

The Type dropdown is used to specify the form in which the weight data are provided. If, for example, your weight series VARWGT contains values proportional to the conditional variance, you should select Variance. Alternately, if your series INVARWGT contains the values proportional to the inverse of the standard deviation of the residuals you should choose Inverse std. dev. Next, you should enter an expression for your weight series in the Weight series edit field.Lastly, you should choose a scaling method for the weights. There are
three choices: Average, None, and (in some cases) EViews default. If you select Average, EViews will, prior to use, scale the weights prior so that the sum to . The EViews default specification scales the weights so the square roots of the sum to . (The latter square root scaling, which offers backward compatibility to EViews 6 and earlier, was originally introduced in an effort to make the weighted residuals comparable to the unweighted residuals.) Note that the EViews default method is only available if you select Inverse std. dev. as weighting Type.