Pearson correlation xam li cas?

2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38

Pearson's correlation coefficient yog covariance ntawm ob qhov sib txawv muab faib los ntawm cov khoom ntawm lawv cov qauv sib txawv.

Kev sib txheeb xam li cas?

Yuav ua li cas xam qhov sib txheeb

1. Nrhiav lub ntsiab lus ntawm txhua tus x-tus nqi.
2. Nrhiav tus qauv sib txawv ntawm txhua tus x-tus nqi (hu nws s_x) thiab tus qauv sib txawv ntawm txhua tus nqi (hu nws s_{y). …}
3. Rau txhua tus n khub (x, y) hauv cov ntaub ntawv teev, nqa.
4. Ntxiv cov txiaj ntsig n ntawm Kauj Ruam 3.
5. Div the sum by s_x ∗ s_y.

Pearson correlation qhia koj li cas?

Pearson qhov sib txheeb coefficient yog qhov kev xeem txheeb cais uas ntsuas kev txheeb cais kev sib raug zoo, lossis kev koom tes, ntawm ob qhov sib txawv tsis tu ncua … zoo li kev coj ntawm kev sib raug zoo.

Vim li cas Pearson txoj kev sib raug zoo siv?

Pearson txoj kev sib raug zoo yog siv thaum koj ua haujlwm nrog ob qhov sib txawv ntawm cov pejxeem. Cov kev tshawb fawb pom tau tias qhov sib txawv yuav qhia tau tias muaj kev sib raug zoo linear, kev sib raug zoo tsis zoo, lossis tsis muaj kev sib raug zoo ntawm txhua qhov.

Pearson tus nqi sib raug zoo yog dab tsi?

Tus nqi ntau nruab nrab ntawm -1.0 thiab 1.0 Tus lej suav ntau dua 1.0 lossis tsawg dua -1.0 txhais tau tias muaj qhov yuam kev hauv kev ntsuas kev sib raug. Ib qho kev sib raug zoo ntawm -1.0 qhia tau hais tias qhov kev sib raug zoo tsis zoo, thaum kev sib raug zoo ntawm 1.0 qhia tau tias muaj kev sib raug zoo zoo.