Tus qauv seem seem (lossis tus qauv seem yuam kev) yog ib qho kev ntsuas siv los ntsuas seb tus qauv regression zoo npaum li cas rau cov ntaub ntawv… Yog li ntawd, siv tus qauv rov ua dua tshiab kom kwv yees qhov tseeb qhov tseem ceeb ntawm cov ntsiab lus no yuav ua rau qhov yuam kev me dua "piv txwv 1 ".
Puas seem tib yam li tus qauv yuam kev?
Txoj kev sib txawv ntawm qhov seem tseem raug hu ua tus qauv sib txawv ntawm cov ntsiab lus nyob ib puag ncig ib kab haum lossis tus qauv yuam kev ntawm kev kwv yees.
Puas yog qhov seem yuam kev zoo ib yam li tus qauv yuam kev ntawm kev thim rov qab?
Koj tuaj yeem pom tus qauv yuam kev ntawm kev thim rov qab, tseem hu ua tus qauv yuam kev ntawmqhov kev kwv yees thiab qhov seem ntawm tus qauv yuam kev, ze R-squared hauv qhov zoo-ntawm- haum seem ntawm feem ntau cov ntaub ntawv pov thawj. Ob qho ntawm cov kev ntsuas no muab rau koj qhov kev ntsuas tus lej ntawm tus qauv zoo npaum li cas rau cov qauv ntaub ntawv.
Puas yog Sigma Qhov seem yuam kev?
feem ntau yog tus lej, qhov kwv yees tus qauv sib txawv ntawm qhov tsis raug ("tus qauv seem seem") rau Gaussian qauv, thiab-tsawg txhais tau-lub hauv paus square ntawm qhov seem deviance ib qib ntawm kev ywj pheej hauv ntau cov qauv. … Yog li ntawd, rau qhov zoo-fitting binomial los yog Poisson GLMs, sigma yog nyob ib ncig ntawm 1
Tus txheej txheem yuam kev ntawm cov seem txhais li cas?
Qhov kev ua yuam kev seem seem yog siv los ntsuas seb tus qauv regression haum rau cov ntaub ntawv li cas. Hauv cov ntsiab lus yooj yim, nws ntsuas tus qauv sib txawv ntawm cov seem nyob hauv tus qauv regression . Nws yog xam raws li: Residual standard yuam kev=√Σ(y – ŷ)2/df.
