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La correlazione e la regressione - Scienze Politiche

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Corre<strong>la</strong>zione<br />

Regressione<br />

Adattamento del modello ai dati<br />

Varianza totale<br />

Varianza spiegata<br />

Varianza residua<br />

1<br />

n<br />

1<br />

n<br />

1<br />

n<br />

Scomposizione del<strong>la</strong> varianza totale<br />

n∑<br />

(y i − µ y ) 2 = σy<br />

2<br />

i=1<br />

n∑<br />

(ŷ i − µ y ) 2 = σŷ<br />

2<br />

i=1<br />

n∑<br />

(y i − ŷ i ) 2 = 1 n∑<br />

ˆϵ 2 i = σ 2ˆϵ<br />

n<br />

i=1<br />

i=1<br />

σ 2 y = σ 2 ŷ + σ 2ˆϵ<br />

. . . . . .<br />

A. Maruotti

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