Cov txheej txheem:
Video: Dab tsi yog qhov kev ua yuam kev hauv kev txheeb cais?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Teb yuam kev tej zaum yuav tshwm sim los ntawm qhov tsis ua hauj lwm ntawm tus neeg teb xov xwm qhia tus nqi raug (tus neeg teb yuam kev ), qhov tsis ua tiav ntawm tus neeg xam phaj los sau cov nqi qhia kom raug (tus neeg xam phaj yuam kev ), los yog qhov tsis ua hauj lwm ntawm cov cuab yeej ntsuas tus nqi kom raug (instrument yuam kev ).
Ua raws li qhov no saib, dab tsi yog qhov tsis teb qhov yuam kev hauv kev txheeb cais?
Tsis teb yuam kev tshwm sim thaum cov sampling units xaiv rau ib qho piv txwv tsis raug xam phaj. Cov chav ua piv txwv feem ntau tsis ua teb vim lawv tsis muaj peev xwm, tsis muaj, lossis tsis kam ua li ntawd.
Ib sab saum toj, dab tsi yog qhov yuam kev hauv stats? Lus Txhais: A statistical yuam kev yog qhov (tsis paub) qhov sib txawv ntawm tus nqi khaws cia thiab tus nqi tseeb. Cov ntsiab lus: Nws yog tam sim ntawd cuam tshuam nrog qhov tseeb vim qhov tseeb yog siv los txhais tau tias "qhov cuam tshuam ntawm tag nrho yuam kev , suav nrog kev tsis ncaj ncees thiab kev sib txawv" (Kish, Survey Sampling, 1965).
Tsis tas li ntawd, dab tsi yog qhov ua rau cov lus teb yuam kev?
Teb yuam kev tuaj yeem tshwm sim hauv plaub hom: (1) Cov neeg teb xov tooj tuaj yeem txhob txwm tshaj tawm lossis tshem tawm cov ntaub ntawv; (2) Cov neeg teb yuav tsis nco qab thaum twg lossis yog tias muaj ib yam dab tsi tshwm sim - rov nco qab; (3) kev to taub yuam kev yuav yog ua rau los ntawm kev sib txawv ntawm cov lus, los ntawm cov qauv kev tshawb fawb nyuaj, lossis los ntawm tus neeg xam phaj tsis muaj peev xwm ua tau
Koj yuav txo cov lus teb li cas?
1. Ceev faj thaum tsim koj daim ntawv nug tshawb fawb
- Khaws koj cov lus nug luv luv thiab meej. Txawm hais tias cov lus nug ncaj nraim tuaj yeem ua suab yooj yim txaus, feem ntau cov kev tshawb fawb tsis ua tiav hauv cheeb tsam no.
- Zam cov lus nug tseem ceeb.
- Zam los yog rhuav tshem cov ntsiab lus nyuaj.
- Siv cov lus nug ib ntus.
- Khaws lub sij hawm luv luv thiab cuam tshuam.
Pom zoo:
Dab tsi yog qhov piv txwv piv txwv hauv kev txheeb cais?
Nyob rau hauv kev txheeb cais, sampling bias yog ib tug bias nyob rau hauv uas ib tug piv txwv yog sau nyob rau hauv xws li ib tug txoj kev uas ib co tswv cuab ntawm cov neeg npaj muaj ib tug tsawg sampling probability tshaj lwm tus
Qhov laj kab qis hauv kev txheeb cais yog dab tsi?
Cov laj kab sab saud thiab qis qis tshaj tawm los ntawm cov ntaub ntawv ntau hauv ib txheej. Cov laj kab feem ntau pom muaj cov qauv hauv qab no: Sab saum toj laj kab = Q3 + (1.5 * IQR) Cov laj kab qis = Q1 - (1.5 * IQR)
Hom 2 yuam kev hauv kev txheeb cais yog dab tsi?
Hom II yuam kev yog ib lo lus txheeb cais hais txog qhov tsis lees paub ntawm qhov tsis tseeb qhov kev xav tsis tseeb. Nws yog siv nyob rau hauv cov ntsiab lus ntawm kev ntsuam xyuas hypothesis. Nyob rau hauv lwm yam lus, nws tsim ib tug cuav zoo. Qhov yuam kev tsis lees txais lwm qhov kev xav, txawm tias nws tsis tshwm sim vim muaj caij nyoog
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
Dab tsi yog cov haujlwm thiab qhov tseem ceeb ntawm kev txheeb cais hauv kev lag luam?
Statistics rau kev lag luam kev txhawj xeeb nws tus kheej nrog kev sau, ua, thiab tshuaj xyuas cov ntaub ntawv kev lag luam tshwj xeeb. Nws pab peb nkag siab thiab txheeb xyuas cov kev xav ntawm kev lag luam thiab qhia txog kev sib raug zoo ntawm kev hloov pauv raws li qhov xav tau, khoom muag, nqi, tso zis thiab lwm yam