管理經(jīng)濟(jì)學(xué),英文版-全文預(yù)覽
【正文】 ession equation ? Ranges from 0 to 1 ? High R2 indicates Y and X are highly correlated Managerial Economics 413 FTest ? Used to test for significance of overall regression equation ? Compare Fstatistic to critical Fvalue from Ftable ? Two degrees of freedom, n – k amp。 do not ge ne ra l l y e qua l t he t rue v a l ue s of amp。Copyright 169。 fi t t e d v a lu e s o f , ?? ?Y a bX??Managerial Economics 44 ??i?S , . ASa m p le r e g re ssio n line11 57 3 4 97 19Sample Regression Line (Figure ) A 0 8,000 2,000 10,000 4,000 6,000 10,000 20,000 30,000 40,000 50,000 60,000 70,000 Advertising expenditures (dollars) Sales (dollars) S ? ? ? ? ? ? ? ?i?S 46,376ei ?iS 60,000Managerial Economics 45 ? The distribution of values the estimates might take is centered around the true value of the parameter ? An estimator is unbiased if its average value (or expected value) is equal to the true value of the parameter Unbiased Estimators ? ??ababT he e s t i m a t e s of
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