Video: Dab tsi yog qhov kev faib khoom ib txwm qhia?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
ib txwm faib nkhaus . Hauv kev txheeb cais, theoretical nkhaus tias qhia ntau npaum li cas qhov kev sim yuav tsim cov txiaj ntsig tshwj xeeb. Cov nkhaus yog sib npaug thiab zoo li lub tswb, qhia tias kev sim siab feem ntau yuav muab cov txiaj ntsig ze qhov nruab nrab , tab sis qee zaus yuav deviate los ntawm ntau ntau.
Thiaj li, qhov zoo ntawm kev faib khoom ib txwm yog dab tsi?
A ib txwm faib yog qhov tseeb symmetrical faib ntawm pom qhov tseem ceeb. Thaum lub histogram raug tsim los ntawm cov txiaj ntsig uas ib txwm faib tawm, tus puab ntawm kab ntawv ua lub tswb symmetrical puab . Qhov no yog vim li no kev faib tawm tseem paub tias yog ' ib txwm nkhaus 'lub 'bell nkhaus '.
Ib yam nkaus, yuav siv txoj kev nkhaus li cas hauv kev txheeb cais? Koj siv tau nws rau txiav txim siab qhov kev faib ua feem ntawm qhov tseem ceeb uas poob hauv tus lej tshwj xeeb ntawm cov qauv sib txawv ntawm qhov nruab nrab. Piv txwv li, hauv a ib txwm faib , 68% ntawm kev soj ntsuam poob hauv +/- 1 tus qauv sib txawv ntawm qhov nruab nrab.
Ib yam li ntawd, koj tuaj yeem nug, koj puas paub tias qee yam ib txwm faib?
Qhov kev xeem Kolmogorov-Smirnov (K-S) thiab Shapiro-Wilk (S-W) yog tsim los ntsuas qhov qub los ntawm kev sib piv koj cov ntaub ntawv rau ib qho ib txwm faib nrog tib lub ntsiab lus thiab tus qauv sib txawv ntawm koj tus qauv. Yog qhov kev xeem tsis yog qhov tseem ceeb, tom qab ntawd cov ntaub ntawv yog ib txwm , yog li tus nqi saum toj no. 05 qhia txog qhov qub.
Dab tsi yog cov yam ntxwv ntawm ib txwm faib nkhaus?
Ntawm no, peb pom plaub yam ntxwv ntawm kev faib khoom ib txwm muaj . Ib txwm faib yog symmetric, unimodal, thiab asymptotic, thiab qhov nruab nrab, nruab nrab, thiab hom yog sib npaug. A kev faib khoom ib txwm muaj yog qhov zoo sib xws nyob ib puag ncig nws qhov chaw. Ntawd yog, sab xis ntawm nruab nrab yog daim iav duab ntawm sab laug.
Pom zoo:
Z txhais li cas hauv kev faib khoom ib txwm?
Ib qho kev faib tawm ib txwm nrog qhov nruab nrab ntawm 0 thiab tus qauv sib txawv ntawm 1 yog hu ua tus qauv kev faib tawm. Piv txwv li, Z ntawm -2.5 sawv cev rau tus nqi 2.5 tus qauv sib txawv hauv qab qhov nruab nrab
Lub luag haujlwm ntawm kev tswj kev faib khoom hauv kev lag luam sib xyaw yog dab tsi?
Kev tswj kev faib khoom yog hais txog cov txheej txheem ntawm kev saib xyuas kev txav ntawm cov khoom los ntawm tus neeg muag khoom lossis cov chaw tsim khoom mus rau qhov muag. Kev tswj kev faib khoom yog ib feem tseem ceeb ntawm lub voj voog ua lag luam rau cov neeg xa khoom thiab cov muag khoom. Cov nyiaj tau los ntawm cov lag luam yog nyob ntawm seb lawv tuaj yeem tig lawv cov khoom sai npaum li cas
Dab tsi yog qhov sib txawv loj ntawm kev sib tham kev yuav khoom thiab kev sib tw sib tw yuav khoom?
Dab tsi yog qhov sib txawv loj ntawm kev sib tham kev yuav khoom thiab kev sib tw sib tw yuav khoom? Hauv kev sib tham txog kev yuav khoom, lub tuam txhab kev ruaj ntseg issuer thiab tus thawj tswj hwm kev nqis peev hauv tuam txhab lag luam sib tham txog tus nqi uas tus tuam txhab lag luam yuav them tus neeg xa khoom rau qhov kev tso nyiaj tshiab
Dab tsi yog qhov sib txawv ntawm ib qho kev xa khoom thiab ntau qhov kev xa khoom uas zoo dua yog vim li cas?
Ib qho kev nrhiav khoom tuaj yeem ua rau lub tuam txhab muaj kev pheej hmoo (piv txwv li, tus neeg muag khoom lub neej ntawd), tab sis, tib lub sijhawm, ntau lub tswv yim muab khoom nthuav tawm ntau dua cov nqi pib thiab tsis tu ncua vim xav tau kev tswj hwm ntau dua ib tus neeg muag khoom
Dab tsi yog qhov kev faib tawm ib txwm nyob hauv kev txheeb cais?
Ib qho kev faib tawm ib txwm muaj lub tswb-puab curveandis symmetrical nyob ib ncig ntawm nws qhov chaw, yog li sab xis ntawm lubcenteris daim iav duab ntawm sab laug. Feem ntau ntawm cov datavalues txuas ntxiv nyob rau hauv ib qho kev faib tawm zoo li pawg ib puag ncig, thiab qhov ntxiv tus nqi yog los ntawm qhov txhais tau tias, qhov tsawg dua yuav tshwm sim