Parametric vs Tsis Parametric
Kev txheeb cais yog ib ceg ntawm kev tshawb fawb uas tso cai rau peb nkag siab txog cov pej xeem muaj zog los ntawm kev siv cov qauv kos los ntawm qee cov pej xeem nyiam. Nws yog ib qho tseem ceeb uas cov qauv no yog random. Ntau cov qauv tsim nrog kev sib koom ua lej, los ua cov kev xav txog cov pej xeem tsis muaj. Lawm, txhua tus pej xeem tuaj yeem muaj "Kev faib tawm ib txwm muaj" qhov twg qhov kev faib tawm ntawm cov ntaub ntawv / cov qauv muaj cov duab ntawm lub tswb nyob hauv cov duab zaus. Hauv kev faib tawm ib txwm, feem ntau ntawm cov qauv tsom ib ncig ntawm qhov nruab nrab thiab 68%, 95%, 99% ntawm cov ntaub ntawv pom nyob rau hauv 1, 2, thiab 3 tus qauv sib txawv raws li. Parametric thiab nonparametric txheeb cais nyob ntawm seb puas los yog tsis ib txwm muab faib.
Parametric Statistics yog dab tsi?
Parametric txheeb cais yog cov txheeb cais uas cov ntaub ntawv / cov qauv raug suav tias yog kos los ntawm kev faib tawm ib txwm. Lub ntsiab lus ntawm parametric txheeb cais yog "cov ntaub ntawv txheeb cais uas xav tias cov ntaub ntawv tau los ntawm ib hom kev muaj feem cuam tshuam thiab ua rau kev txiav txim siab txog qhov tsis muaj kev faib tawm". Feem ntau ntawm cov kev paub txog kev txheeb xyuas theem pib muaj nyob rau pawg no. Nyob rau hauv qhov tseeb, tej zaum lawv yuav tsis raug faib. Yog li ntawd, hom kev txheeb cais no yog nyob ntawm ntau qhov kev xav. Yog tias cov ntaub ntawv / cov qauv feem ntau faib los yog yuav luag ib txwm faib, cov qauv yuav tsim cov txiaj ntsig raug thiab cov kev xav tau. Txawm li cas los xij, yog tias qhov kev xav ntawm kev faib tawm ib txwm tsis raug, cov ntaub ntawv parametric tuaj yeem ua yuam kev heev.
Non-parametric Statistics yog dab tsi?
Tsis yog parametric txheeb cais tseem hu ua kev faib tawm-dawb txheeb cais. Qhov zoo ntawm hom kev txheeb cais no yog tias nws tsis tas yuav ua qhov kev xav raws li yav dhau los tau ua nrog parametrics. Tsis yog parametric statistic suav suav cov nruab nrab hauv kev mloog dua li qhov txhais tau tias. Yog li ntawd, yog hais tias ib los yog ob tug deviates los ntawm tus nqi nruab nrab, lawv cov nyhuv yog neglected. Feem ntau parametric txheeb cais yog qhov nyiam tshaj qhov no vim tias nws muaj hwj chim ntau dua los tsis lees paub qhov kev xav tsis tseeb dua li txoj kev tsis yog parametric. Ib qho kev xeem uas tsis yog parametric feem ntau paub yog Chi-square test. Muaj cov nonparametric analogues rau qee qhov kev ntsuas parametric xws li, Wilcoxon T Test rau Paired sample t-test, Mann-Whitney U Test rau Independent samples t-test, Spearman's correlation for Pearson's correlation etc. Rau ib qho qauv t-test, tsis muaj piv tsis tau parametric test.
Qhov txawv ntawm Parametric thiab Non-parametric yog dab tsi?
• Parametric txheeb cais nyob ntawm qhov kev faib tawm ib txwm, tab sis tsis yog parametric txheeb cais tsis nyob ntawm kev faib tawm ib txwm.
• Parametric cov txheeb cais ua qhov kev xav ntau dua li qhov tsis yog Parametric txheeb cais.
• Parametric cov txheeb cais siv cov qauv yooj yim dua piv rau cov txheeb cais tsis yog Parametric.
• Thaum cov pej xeem ntseeg tias ib txwm faib los yog ze rau ib txwm faib, parametric txheeb cais yog qhov zoo tshaj plaws los siv. Yog tias tsis yog, nws yog qhov zoo tshaj plaws uas siv cov txheej txheem nonparametric.
• Feem ntau ntawm cov kev paub txog kev txheeb xyuas theem pib muaj nyob rau hauv parametric txheeb cais. Tsis yog parametric txheeb cais yog siv me me thiab siv rau cov xwm txheej tshwj xeeb.
