Zoo, database normalization yog tus txheej txheem ntawm kev teeb tsa cov ntaub ntawv sib raug zoo raws li cov ntawv hu ua ib txwm siv txhawm rau txo cov ntaub ntawv rov ua dua thiab txhim kho cov ntaub ntawv ncaj ncees. Hauv cov ntsiab lus yooj yim, normalization ua kom txhua yam ntawm koj cov ntaub ntawv zoo li thiab nyeem tib txoj hauv kev hla txhua cov ntaub ntawv.
Yuav ua li cas cov ntaub ntawv tuaj yeem ua tau zoo dhau lawm?
"Over-normalization" txhais tau tias a database qeeb dhau vim muaj coob tus tuaj koom. Qhov no kuj tseem txhais tau hais tias lub database tau outgrown hardware. Los yog tias cov ntawv thov tsis tau tsim los ntsuas.
Vim li cas peb thiaj li cov ntaub ntawv zoo li qub?
Lub hom phiaj ntawm normalization yog hloov cov txiaj ntsig ntawm kab zauv hauv cov ntaub ntawv rau ib qho kev ntsuas, yam tsis muaj qhov sib txawv ntawm qhov sib txawv ntawm qhov muaj nuj nqis. Rau kev kawm tshuab, txhua dataset tsis xav tau normalization. Nws yuav tsum tau tsuas yog thaum nta muaj ntau yam sib txawv.
Koj puas tuaj yeem nruab nrab cov ntaub ntawv zoo li qub?
Normalizing cov ntaub ntawv hauv Excel
Koj tuaj yeem siv AVERAGE muaj nuj nqi los xam cov lej lej (lossis nruab nrab) ntawm cov ntaub ntawv teev. Cia peb saib yuav ua li cas koj tuaj yeem normalize cov ntaub ntawv siv cov haujlwm no. Pib los ntawm kev xam qhov nruab nrab thiab tus qauv sib txawv ntawm cov ntaub ntawv teev. … Qhov nruab nrab ntawm z-score rau a cov ntaub ntawvyog xoom (0).
Kuv yuav ua li cas cov ntaub ntawv rau 100 feem pua hauv Excel?
Kom normalize cov nqi hauv cov ntaub ntawv kom nyob nruab nrab ntawm 0 thiab 100, koj tuaj yeem sivcov qauv hauv qab no:
- zi=(xi – min(x)) / (max(x) – min(x))100.
- zi=(xi – min(x)) / (max(x) – min(x))Q.
- Min-Max Normalization.
- Mean Normalization.
