Cov txheej txheem:
Video: Dab tsi yog cov ntaub ntawv tsis sib xws?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov ntaub ntawv tsis sib xws yog cov ntaub ntawv uas peb sau tau uas suav tau thiab tsuas yog muaj qee tus nqi. Piv txwv ntawm discrete cov ntaub ntawv suav nrog cov neeg nyob hauv ib chav kawm, cov lus nug tau teb kom raug, thiab kev khiav hauv tsev ntaus. Cov duab thiab cov duab yog ob txoj hauv kev los qhia qhov discrete cov ntaub ntawv uas koj sau.
Xav txog qhov no, cov ntaub ntawv sib cais yog dab tsi?
Kev txhais ntawm Cov ntaub ntawv tsis sib xws : Cov ntaub ntawv uas tuaj yeem muab faib ua kev faib tawm. Cov ntaub ntawv tsis sib xws yog nyob ntawm suav. Tsuas yog tus naj npawb finite ntawm qhov tseem ceeb tuaj yeem ua tau, thiab cov txiaj ntsig tsis tuaj yeem muab faib ua lub ntsiab lus. Nws yog feem ntau suav nrog tag nrho cov lej.
Tsis tas li ntawd, cov ntaub ntawv tsis sib xws yog dab tsi? Quantitative cov ntaub ntawv tej zaum yuav yog tsis paub meej los yog tsis tu ncua . Tag nrho cov ntaub ntawv uas yog qhov tshwm sim ntawm kev suav yog hu ua quantitative discrete data . Cov no cov ntaub ntawv noj tsuas yog qee qhov txiaj ntsig ntawm tus lej. Yog tias koj suav cov xov tooj uas koj tau txais rau txhua hnub ntawm lub lim tiam, koj yuav tau txais txiaj ntsig xws li xoom, ib, ob, lossis peb.
Tom qab ntawd, plaub yam sib txawv ntawm cov ntaub ntawv tsis sib xws yog dab tsi?
Categorical/Discrete/Qualitative data
- Nominal (unordered) variables, xws li poj niam txiv neej, haiv neeg keeb kwm, kev ntseeg lossis kev nom kev tswv.
- Ordinal (ordered) variables, e.g., qib, theem nyiaj tau los, qib tsev kawm ntawv.
- Discrete interval variables uas tsuas muaj ob peb qhov tseem ceeb, xws li, tus naj npawb ntawm cov sij hawm sib yuav.
Puas yog khau loj discrete lossis txuas ntxiv?
1. Nkawm khau loj yog tus lej tag nrho ( tsis paub meej ), tab sis lub hauv paus ntsuas yog ko taw ntev uas yog ntsuas ( tsis tu ncua ) cov ntaub ntawv. Txawm ib nrab qhov ntau thiab tsawg tseem tsis tau ntsuas tiag tiag tab sis "tag nrho tus lej", vim tias tsis muaj dab tsi ntawm qhov loj 8 thiab 8 1/2. 2.
Pom zoo:
Txoj kev faib cov ntaub ntawv twg muab cov ntaub ntawv sib npaug ntawm cov ntaub ntawv lossis cov kev tshuaj xyuas hauv txhua chav kawm cov ntaub ntawv?
Quantile. txhua chav kawm muaj cov yam ntxwv sib npaug. Ib qho kev faib tawm ntau yog zoo haum rau cov ntaub ntawv faib tawm. Quantile muab tib tus lej ntawm cov ntaub ntawv muaj nuj nqis rau txhua chav kawm
Cov yam ntxwv ntawm cov ntaub ntawv twg yog qhov ntsuas ntawm tus nqi uas cov ntaub ntawv muaj nuj nqis heev?
Variation: Ib qho kev ntsuas ntawm tus nqi uas cov ntaub ntawv muaj nuj nqis sib txawv. ? Kev faib tawm: Cov xwm txheej lossis cov duab ntawm kev sib kis ntawm cov ntaub ntawv hla ntau qhov tseem ceeb (xws li tswb-puab). ? Outliers: Cov qauv piv txwv uas nyob deb heev ntawm feem ntau ntawm lwm cov qauv nqi
Thaum muab piv cov qauv sau rau ib tus neeg raug liam cov ntaub ntawv lub hnub nyoog sib txawv ntawm cov ntaub ntawv yuav tsum tsis pub tshaj kaum ob lub hlis?
Thaum piv cov qauv sau rau tus neeg raug liam? cov ntaub ntawv, lub hnub nyoog sib txawv ntawm cov ntaub ntawv yuav tsum tsis pub ntau tshaj rau rau kaum ob lub hlis. Tus lej txaus ntawm tus qauv yog qhov tseem ceeb rau kev txiav txim siab qhov tshwm sim ntawm kev sib piv
Dab tsi yog qhov txhais ntawm cov ntaub ntawv tsis sib xws?
Txhais cov ntaub ntawv Discrete: Cov ntaub ntawv uas tuaj yeem muab faib ua kev faib tawm. Cov ntaub ntawv tsis sib xws yog nyob ntawm kev suav. Tsuas yog tus naj npawb finite ntawm qhov tseem ceeb tuaj yeem ua tau, thiab cov txiaj ntsig tsis tuaj yeem muab faib ua lub ntsiab lus. Nws yog feem ntau suav nrog tag nrho cov lej
Dab tsi yog cov cuab yeej lossis cov ntaub ntawv uas tus Kws Tshawb Fawb xav tau los txheeb xyuas cov ntaub ntawv nug?
Cov ntaub ntawv raug nug hauv chav kuaj ua txhaum cai yog nruab nrog lub tshuab ntsuas ntsuas, ntsuas cov duab digital, infrared thiab ultraviolet lub teeb ci, cov cuab yeej tshuaj ntsuam video thiab cov cuab yeej tshwj xeeb suav nrog cov khoom siv hluav taws xob tshawb pom electrostatic (EDD) thiab cov khoom siv los ua chemistry