Video: Bayes theorem hais li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Bayes' theorem ( kuj hu ua Bayes txoj cai los yog Bayes 'law) yog a tshwm sim nyob rau hauv probabil-ity theory uas hais txog tej yam tshwm sim. Yog tias A thiab B qhia txog ob qhov xwm txheej, P (A | B) qhia txog qhov xwm txheej tshwm sim ntawm A tshwm sim, muab qhov B tshwm sim.
Ntawm no, Bayes theorem qhia peb li cas?
Bayes ' theorem , muaj npe tom qab 18th-xyoo pua British mathematician Thomas Bayes , yog ib tug qauv lej rau kev txiav txim siab tej yam tshwm sim. Cov theorem muab ib txoj hauv kev los kho cov kev kwv yees uas twb muaj lawm lossis kev xav (hloov qhov yuav tshwm sim) muab pov thawj tshiab lossis ntxiv pov thawj.
Ib tug kuj nug, koj siv Bayes Theorem li cas? Cov mis yog:
- P(A|B) = P(A) P(B|A)P(B)
- P(Man|Pink) = P(txiv neej) P(Pink|Man)P(Pink)
- P(Man|Pink) = 0.4 × 0.1250.25 = 0.2.
- Ob txoj hauv kev tau txais tib qhov txiaj ntsig ntawm ss + t + u + v.
- P(A|B) = P(A) P(B|A)P(B)
- P(Allergy | Yog) = P(Allergy) P(Yog | Allergy)P(Yog)
- P(Allergy | Yog) = 1% × 80% 10.7% = 7.48%
Tom qab ntawd, ib tus tuaj yeem nug, Bayes theorem yog dab tsi hauv qhov tshwm sim?
Hauv qhov tshwm sim kev tshawb xav thiab kev txheeb cais, Bayes lub theorem (xws li Bayes cov law lub Bayes txoj cai ) piav txog cov qhov tshwm sim ntawm ib qho kev tshwm sim, raws li kev paub ua ntej ntawm cov xwm txheej uas yuav cuam tshuam nrog qhov xwm txheej. Hauv qhov nws hu ua scholium, Bayes txuas nws algorithm rau tej yam tsis paub ua ntej.
Bayes theorem yog dab tsi thiab sib tham txog nws cov lus qhia?
Bayes ' theorem yog a qauv uas piav qhia yuav hloov kho li cas tus Qhov tshwm sim ntawm hypotheses thaum muab pov thawj. Nws raws li yooj yim los ntawm tus axioms ntawm conditional probability, tab sis yuav siv tau rau haib vim li cas txog ntau yam teeb meem nrog rau kev ntseeg tshiab.
Pom zoo:
Koj txhais li cas los ntawm sampling theorem?
Cov qauv piv txwv qhia txog qhov tsawg kawg nkaus-sampling tus nqi uas lub teeb liab txuas ntxiv-lub sij hawm yuav tsum tau ua tib yam qauv kom cov teeb liab qub tuaj yeem rov qab los yog rov tsim dua los ntawm cov qauv no ib leeg. Qhov no feem ntau yog hu ua Shannon's sampling theorem hauv cov ntaub ntawv
Kev ntsuam xyuas hais lus thiab tsis hais lus yog dab tsi?
Kev hais lus tsis yog lus yog kev daws teeb meem siv cov duab thiab cov duab kos. Nws ntsuam xyuas lub peev xwm los soj ntsuam cov ntaub ntawv pom thiab daws teeb meem raws li qhov pom kev xav. Qhov tseem ceeb, kev hais lus hais lus ua haujlwm nrog cov lus thiab tsis yog hais lus ua haujlwm nrog cov duab thiab daim duab
Dab tsi yog qhov tseem ceeb ntawm sampling theorem?
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Lub sij hawm nyob rau hauv ontology yog dab tsi yog hais txog cov lus piav qhia hierarchical thiab cov lus hais txog ib qho tshwj xeeb?
Lub schema yog ib lo lus ontology uas hais txog cov lus piav qhia hierarchical thiab cov lus hais txog ib lub npe. Ib lub npe sawv cev rau tag nrho lub tuam txhab lossis kev faib hauv ib lub tuam txhab. Ib tug cwj pwm yog ib tug yam ntxwv tshwj xeeb hais txog ib chav kawm, uas yog ib hom khoom
Dab tsi yog tus hais lus sau nws lub hom phiaj thiab dab tsi yog yam tseem ceeb uas yuav tsum nco ntsoov txog cov lus hais?
Cov neeg hais lus sau ntawv yog cov ntawv qhia uas tus neeg nthuav qhia siv thaum nthuav qhia qhov kev nthuav qhia. Lawv pab tus neeg nthuav qhia nco txog cov ntsiab lus tseem ceeb thaum muab kev nthuav qhia. Lawv tshwm sim ntawm tus swb thiab tuaj yeem pom tsuas yog los ntawm tus tshaj tawm thiab tsis yog cov neeg tuaj saib