Yuav ua li cas koj thiaj nrhiav tau tus nqi ruaj khov uas siv qhov tsawg tshaj plaws squares regression?

2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2024-01-18 08:18

Kev suav ntawm tag nrho cov nqi tas li (a):

1. Siv tus txoj kev ntawm tsawg squares , cov nqi Kev ua haujlwm ntawm Master Chemicals yog: y = $ 14, 620 + $ 11.77x.
2. Tag nrho nqi ntawm qib kev ua si ntawm 6, 000 fwj: y = $ 14, 620 + ($ 11.77 × 6, 000) = $ 85, 240.
3. Tag nrho nqi ntawm qib kev ua si ntawm 12,000 fwj: y = $ 14, 620 + ($ 11.77 × 12, 000)

Tsis tas li ntawd, koj yuav ua li cas xam qhov tsawg kawg nkaus square regression?

Cov kauj ruam

1. Kauj Ruam 1: Rau txhua tus (x, y) taw tes suav x² thiab xy.
2. Kauj ruam 2: Sum tag nrho x, y, x² thiab xy, uas muab peb Σx, Σy, Σx² thiab Σxy (Σ txhais tau tias "sum up")
3. Kauj Ruam 3: xam Slope m:
4. m = N Σ(xy) − Σx Σy N Σ(x²) - (∙x)²
5. Kauj Ruam 4: xam Intercept b:
6. b = Σy − m Σx N.
7. Kauj Ruam 5: Sib dhos qhov sib npaug ntawm ib kab.

Dab tsi yog lub ntsiab lus ntawm tsawg kawg squares nyob rau hauv tus qauv regression? Cov Tsawg Squares Regression Kab yog txoj kab uas ua rau ntsug nrug ntawm cov ntaub ntawv cov ntsiab lus mus rau regression kab me me li sai tau. Nws hu ua tsawg squares ” vim tias txoj kab zoo tshaj plaws ntawm kev haum yog ib qho uas txo qis qhov sib txawv (tus lej ntawm squares ntawm qhov yuam kev).

Raws li, koj siv txoj kev squares tsawg kawg li cas?

Cov txoj kev ntawm tsawg squares xav tias qhov zoo tshaj plaws haum nkhaus ntawm ib hom yog qhov nkhaus uas muaj qhov tsawg kawg nkaus ntawm kev sib txawv, piv txwv li, tsawg square yuam kev los ntawm ib pawg ntawm cov ntaub ntawv. Raws li cov txoj kev ntawm tsawg squares , qhov zoo tshaj plaws haum nkhaus muaj cov cuab yeej uas ∑ 1 n e i 2 = ∑ 1 n [y i − f (x i)] 2 yog yam tsawg kawg nkaus.

Hauv txoj hauv kev twg rau kev kwv yees tus nqi tsawg kawg yog siv cov squares?

Cov tsawg kawg - squares txoj kev ntawm tus nqi kwv yees suav nrog kev siv lej regression cov tswv yim los xam qhov nqes hav thiab cuam tshuam ntawm txoj kab zoo tshaj plaws rau cov nqi siv hauv kev kwv yees . Txhawm rau txiav txim siab qhov kev kwv yees no, tus thawj tswj hwm yuav sib sau ua ke nqi cov ntaub ntawv los ntawm nqi thiab qib ntawm kev tsim khoom.