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La Regressione Multipla - DSE

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Statistica F<br />

F<br />

SQR − SQR n−k SQR q<br />

= V NV ⋅<br />

NV<br />

• <strong>La</strong> statistica F rifiuta quando l’inclusione del vincolo<br />

fa aumentare “troppo” la SQR – cioè quando il<br />

vincolo fa peggiorare “troppo” l’adattamento della<br />

regressione<br />

• <strong>La</strong> statistica F è approssimabile da<br />

35<br />

2<br />

χ q /q per n grande.

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