Cov txheej txheem:
Video: Yuav ua li cas koj xam nonlinear regression?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog koj qauv siv ib kev sib npaug hauv daim ntawv Y = a0 + b1X1, yog a linear regression qauv . Yog tsis yog, nws yog nonlinear.
Y = f(X, β) + ε
- X = a vector of p twv,
- β = ib vector ntawm k parameters,
- f(-) = paub regression muaj nuj nqi,
- ε = lub sij hawm yuam kev.
Ib yam li ntawd, nws raug nug, dab tsi yog tus qauv nonlinear regression?
Hauv kev txheeb cais, nonlinear regression yog ib daim ntawv ntawm tsom xam regression nyob rau hauv uas cov ntaub ntawv soj ntsuam yog qauv los ntawm ib tug muaj nuj nqi uas yog nonlinear kev sib xyaw ntawm cov qauv parameters thiab nyob ntawm ib los yog ntau yam kev hloov pauv ywj pheej. Cov ntaub ntawv yog haum los ntawm ib txoj kev ntawm successive approximations.
Qhov thib ob, dab tsi yog nonlinear regression siv rau? Nonlinear regression yog ib daim ntawv ntawm regression tsom xam nyob rau hauv uas cov ntaub ntawv yog haum rau ib tug qauv thiab ces qhia raws li ib tug lej muaj nuj nqi. Nonlinear regression siv logarithmic functions, trigonometric functions, exponential functions, thiab lwm yam haum txoj kev.
Hauv qhov no, koj yuav txiav txim siab li cas linear lossis nonlinear regression?
A linear regression equation tsuas sums cov nqe lus. Thaum lub qauv yuav tsum yog kab tawm nyob rau hauv parameters, koj tuaj yeem tsa qhov kev hloov pauv ywj pheej los ntawm tus exponent kom haum rau qhov nkhaus. Piv txwv li, koj tuaj yeem suav nrog lub sijhawm squared lossis cubed. Nonlinear regression cov qauv yog txhua yam uas tsis ua raws li daim ntawv no.
Dab tsi yog hom regression?
Hom Regression
- Linear Regression. Nws yog qhov yooj yim tshaj plaws ntawm regression.
- Polynomial Regression. Nws yog ib qho txheej txheem kom haum ib qho kev sib npaug nonlinear los ntawm kev noj cov dej num polynomial ntawm kev ywj pheej sib txawv.
- Logistic Regression.
- Quantile Regression.
- Ridge Regression.
- Lasso Regression.
- Elastic Net Regression.
- Thawj Cheebtsam Regression (PCR)
Pom zoo:
Yuav ua li cas koj xam sinusoidal regression?
Sinusoidal Regression. Kho qhov tseem ceeb ntawm A, B, C, thiab D nyob rau hauv kab zauv y = A * sin(B(x-C)) + D kom ua ib tug sinusoidal nkhaus haum ib tug muab ntawm randomly generated cov ntaub ntawv. Thaum koj muaj kev ua haujlwm zoo, nyem rau ntawm 'Qhia suav' kom pom cov kab rov qab suav. Siv 'ctr-R' los tsim cov ntaub ntawv tshiab thiab sim dua
Koj yuav paub li cas yog qhov sib npaug yog linear lossis nonlinear?
Siv ib qho Equation Simplify qhov sib npaug kom ze li sai tau rau daim ntawv y = mx + b. Tshawb xyuas seb koj qhov kev sib npaug puas muaj cov exponents. Yog hais tias nws muaj exponents, nws yog nonlinear. Yog tias koj qhov kev sib npaug tsis muaj tus lej, nws yog linear
Yuav ua li cas koj xam lub sij hawm nws yuav siv sij hawm mus ncig teb chaws?
Kwv yees seb koj yuav mus sai npaum li cas ntawm koj qhov kev mus ncig. Tom qab ntawd, faib koj qhov kev ncua deb ntawm koj qhov nrawm. Qhov no yuav muab rau koj anestimation ntawm koj lub sijhawm mus ncig. Piv txwv li, yog tias koj mus ncig yog 240 mais thiab koj yuav tsav 40 mais ib teev, koj lub sijhawm yuav yog 240/40 = 6hours
Thaum twg koj yuav tsum siv correlation thiab thaum twg koj yuav tsum siv yooj yim linear regression?
Regression feem ntau yog siv los tsim cov qauv / qhov sib npaug los kwv yees cov lus teb tseem ceeb, Y, los ntawm cov txheej txheem kwv yees (X) sib txawv. Kev sib raug zoo feem ntau yog siv los ua kom sai thiab ua kom luv luv cov kev taw qhia thiab lub zog ntawm kev sib raug zoo ntawm ib pawg ntawm 2 lossis ntau tus lej sib txawv
Yuav ua li cas koj xam lub sij hawm nws yuav siv ib yam khoom los poob?
Ntsuas qhov deb ntawm qhov khoom yuav poob hauv ko taw nrog tus pas ntsuas lossis ntsuas daim kab xev. Faib qhov kev ncua deb los ntawm 16. Piv txwv li, yog tias cov khoom yuav poob 128 ko taw, faib 128 los ntawm 16 kom tau 8. Xam cov square root ntawm cov kauj ruam 2 los nrhiav lub sij hawm nws yuav siv cov khoom poob hauv vib nas this