Video: Kev kho mob sib txawv yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov txheej txheem feem ntau nyob rau hauv regression yog hu ua " kev kho mob sib txawv ": nrog kev kho mob sib txawv , thawj theem ntawm qhov sib txawv categorical yog muab tus nqi 0, thiab tom qab ntawd lwm qib ntsuas qhov hloov pauv ntawm thawj qib. Ua ntej, saib cov qib uas cuam tshuam nrog txhua qhov sib txawv ntawm categorical.
Kuj paub, dab tsi yog qhov sib txawv orthogonal?
Orthogonal sib txawv . Orthogonal sib txawv rau kev tsom xam ntawm qhov sib txawv yog cov kev sib piv ntawm cov kab sib txawv ntawm cov pab pawg ntawm qhov tseem ceeb nrog yam tsawg kawg peb theem. Cov qhov sib txawv yog orthogonal vim lawv muaj pes tsawg tus lej ntawm cov khoom ntawm lawv cov coefficients (2x0 + -1x1 + -1x-1 = 0).
Tsis tas li ntawd, qhov sib piv coefficient hauv Anova yog dab tsi? Rau ib txoj kev ANOVA , a sib piv yog ib qho kev sib piv tshwj xeeb ntawm Kev Kho Mob txhais tau tias. Zoo sib xws Cov neeg nyob ib puag ncig yog tsim los sim ib qho kev xav tshwj xeeb ntsig txog Kev Kho Mob txhais tau tias raws li qee cov ntaub ntawv ua ntej txog Cov Pab Pawg Kho Mob.
Ntawm no, qhov sib txawv hauv kev txheeb cais yog dab tsi?
Hauv txheeb cais , tshwj xeeb tshaj yog nyob rau hauv kev tsom xam ntawm qhov sib txawv thiab linear regression, a sib piv yog ib qho kev sib xyaw ua ke ntawm cov sib txawv (tsis muaj los yog txheeb cais ) uas nws cov coefficients ntxiv mus rau xoom, tso cai rau kev sib piv ntawm cov kev kho mob sib txawv.
Contrast matrix yog dab tsi?
" Qhov sib txawv matrix "yog siv los sawv cev rau categorical IVs (factors) hauv kev ua qauv. tshwj xeeb tshaj yog, nws yog siv los recode ib qho tseem ceeb rau hauv ib pawg " sib piv variables" (dummy variables tsuas yog ib qho piv txwv). Txhua hom sib piv variables muaj nws tus kheej sib xws sib piv matrix.
Pom zoo:
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