Video: Puas yog sigma txhais tau tias tag nrho?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Sigma Lus cim. Σ Lub cim no (hu ua Sigma ) txhais tau tias "sum up"
Tsuas yog li ntawd, Sigma txhais li cas hauv kev txheeb cais?
Hauv txheeb cais , tus qauv sib txawv (SD, kuj sawv cev los ntawm tsab ntawv Greek sigma σ rau cov pej xeem tus qauv sib txawv los yog tsab ntawv Latin s rau cov qauv qauv sib txawv) yog ib qho kev ntsuas ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov txiaj ntsig.
Ib tug kuj nug, koj yuav xam Sigma li cas? OK, cia peb tam sim no xam tus qauv StandardDeviation:
- Ua haujlwm tawm lub ntsiab lus.
- Tom qab ntawd rau txhua tus lej: rho tus Mean thiab square theresult.
- Tom qab ntawd ua haujlwm tawm qhov nruab nrab ntawm cov squared sib txawv. Txhawm rau ntsuas qhov ntsuas, ntxiv tag nrho cov txiaj ntsig ces faib los ntawm pes tsawg. Buthang yog
- Siv lub hauv paus square ntawm qhov ntawd:
Ua raws li qhov no, qhov no txhais li cas ∑?
hauv lej, lub cim no txhais tau tias summation (lub nroog Greek cim) yog qhov sib ntxiv ntawm ib ntu ntawm cov lej; qhov tshwm sim yog tus lej ntawm tag nrho. yog tus lej yog ntxiv sequentially los ntawm sab laug mus rau sab xis, tej intermediateresult yog ib feem sum, prefix sum, los yog khiav tag nrho ntawm thesummation.
Lub cim rau Sigma yog dab tsi?
Sigma yog tsab ntawv thib 18 ntawm cov tsiaj ntawv Greek thiab sib npaug rau peb tsab ntawv 'S'. Hauv lej, cov ntaub ntawv loj sigma yog siv rau kev sau ntawv summation. Cov ntaub ntawv qis sigma stands rau standard deviation. Yog tias koj pom, ob lub qauv uas siv ob qho no cim ob leeg pib nrog tsab ntawv 's'.
Pom zoo:
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