Question: In equation (6.39), the difference - was scaled by an estimate of the variance of to obtain the statistic, DFFITS, Show that if we scale

In equation (6.39), the difference - was scaled by an estimate of the variance of to obtain the statistic, DFFITS, Show that if we scale by the estimated variance in equation (6.41), the statistic is identical to the Studencized residual.

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