the correction for heteroskedasticity in the regression error terms follows that employes by C. This amounts to thress-stage weighted repeat sales procedure, in which the first stage is an ordinary least squares regression estimate of 1. Next, the squared errors from this regression are themselves regressed on a constant and the time between trasaction. The third stage involves a generalized least squares regression, where the stage-one regression is repeated after dividing each observation by the square root of the fitted value of the second stage.
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