Lub ntsiab lus ntawm chi square faib yog dab tsi?
Lub ntsiab lus ntawm chi square faib yog dab tsi?

Video: Lub ntsiab lus ntawm chi square faib yog dab tsi?

Video: Lub ntsiab lus ntawm chi square faib yog dab tsi?
Video: Nkauj hmoob TikTok | gái dân tộc gái vùng cao hmoob Việt Nam 2023 2024, Kaum ib hlis
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Cov Chi Square kev faib khoom yog kev faib tawm ntawm cov sum ntawm squared standard normal deviates. Cov degrees ntawm kev ywj pheej ntawm cov kev faib tawm yog sib npaug rau tus naj npawb ntawm tus qauv ib txwm deviates raug summed. Cov txhais tau tias ntawm Chi Square faib yog nws qib kev ywj pheej.

Ib yam li ntawd, 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.

Ib yam li ntawd, chi square puas xav tau kev faib tawm ib txwm? 2 Teb. Normality yog qhov yuav tsum tau rau cov qis square kuaj tias qhov sib txawv sib npaug ntawm tus nqi teev tab sis muaj ntau qhov kev xeem uas hu ua qee - square vim lawv asymptotic null kev faib tawm yog qee - square xws li cov qee - square xeem rau kev ywj pheej nyob rau hauv contingency rooj thiab cov qis square qhov zoo ntawm kev xeem haum.

Ib tug kuj yuav nug, vim li cas chi square faib ib txwm zoo?

Tus nqi suav ntawm Chi - Square yog ib txwm zoo vim qhov sib txawv ntawm Observed zaus thiab qhov xav tau zaus yog squared , yog (O - E)2 thiab tus demoninator yog tus naj npawb xav tau uas yuav tsum yog zoo . Cov Chi - Square faib yog zoo skewed.

Chi square degrees ntawm kev ywj pheej yog dab tsi?

Cov qib kev ywj pheej rau cov qee - square suav nrog cov hauv qab no qauv : df = (r-1)(c-1) qhov twg r yog tus lej ntawm kab thiab c yog tus lej ntawm kab. Yog tias pom qee - square xeem statistic ntau dua qhov tseem ceeb, qhov null hypothesis tuaj yeem tsis lees paub.

Pom zoo: