Lub chi squared faib los ntawm qhov twg?
Lub chi squared faib los ntawm qhov twg?

Video: Lub chi squared faib los ntawm qhov twg?

Video: Lub chi squared faib los ntawm qhov twg?
Video: KOV POJNIAM QHOV TWG 2024, Kaum ib hlis
Anonim

Cov qee - square faib yog tau raws li qhov sib npaug ntawm cov squares ntawm k ywj siab, xoom-mean, unit-variance Gaussian random variables. Generalizations ntawm no faib tau tau los ntawm kev suav cov squares ntawm lwm hom Gaussian random variables.

Tsis tas li ntawd, tus qauv sib txawv ntawm Chi square faib yog dab tsi?

Thaum df> 90, lub qee - square nkhaus approximates lub ib txwm faib . Rau X∼χ21, 000 X ∼ χ 1, 000 2 lub ntsiab lus, Μ = df = 1, 000 Μ = d f = 1, 000 thiab cov txheem sib txawv , σ = √2(1,000) σ = 2(1,000).

chi square faib nrog piv txwv yog dab tsi? Cov Chi - Square Distribution Cov chi square faib yog cov kev faib tawm ntawm cov sum ntawm cov random cov qauv squared . Cov degrees ntawm kev ywj pheej (k) yog sib npaug rau tus naj npawb ntawm cov qauv ua summ. Rau piv txwv , yog tias koj tau txais 10 cov qauv los ntawm qhov qub kev faib tawm df = 10.

Chi square feem ntau faib?

Lub ntsiab lus ntawm a Chi Square faib yog nws qib kev ywj pheej. Chi Square kev faib tawm yog qhov zoo skewed, nrog rau qib ntawm skew txo nrog nce qib ntawm kev ywj pheej. Raws li qib ntawm kev ywj pheej nce, lub Chi Square faib mus kom ze a ib txwm faib.

Chi Square qhia peb li cas?

Cov Chi - square kev xeem yog npaj los kuaj seb yuav ua li cas thiaj li pom tau tias kev faib tawm yog vim muaj caij nyoog. Nws tseem yog hu ua "kev ua tau zoo ntawm kev sib haum xeeb", vim tias nws ntsuas tau zoo npaum li cas cov kev faib tawm ntawm cov ntaub ntawv haum nrog cov kev faib tawm uas xav tau yog tias qhov sib txawv yog ywj siab.

Pom zoo: