Puas yog cov kwv yees tsis ncaj ncees lawm?

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Puas yog cov kwv yees tsis ncaj ncees lawm?
Puas yog cov kwv yees tsis ncaj ncees lawm?

Video: Puas yog cov kwv yees tsis ncaj ncees lawm?

Video: Puas yog cov kwv yees tsis ncaj ncees lawm?
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Theorem hais tias txhua qhov kev kwv yees uas tsis ncaj ncees rau qhov tsis paub ntau npaum li cas thiab qhov ntawd nyob ntawm cov ntaub ntawv tsuas yog dhau los ntawm kev ua tiav, cov ntaub ntawv txaus yog qhov kev kwv yees zoo tshaj plaws uas tsis muaj kev kwv yees ntawm qhov ntawd ntau.

Is UMVUE unique?

1 Teb. Feem ntau, an UMVUE yog qhov tseem ceeb tshwj xeeb. Qhov kwv yees koj muab tsis yog UMVUE txawm li cas los xij, qhov tseeb nws tsis yog tsis ncaj ncees lawm !! Daim ntawv ceeb toom tias E[1−X]=1−E[X]=1−p muab tias peb qhov sib txawv tsis sib xws yog Bernoulli nrog qhov ntsuas p.

Puas tus kwv tsis ncaj ncees ib txwm muaj?

Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias ib qho kev sib txawv yam tsawg kawg nkaus uas tsis muaj kev kwv yees yuav tsis muaj nyob ib txwm muaj, thiab txawm tias nws ua li cas los peb yuav nrhiav tsis tau. Tsis muaj ib txoj hauv kev uas yuav ib txwm tsim MVUE. Ib txoj hauv kev muaj txiaj ntsig los nrhiav MVUE pib los ntawm kev nrhiav cov ntaub ntawv txaus rau qhov ntsuas.

YPuas yog UMVUE thiab MVUE ib yam?

Nyob rau hauv kev txheeb cais qhov tsawg kawg nkaus-variance unbiased kwv yees ( MVUE) los yog uniformly yam tsawg kawg nkaus-variance unbiased kwv yees (UMVUE) yog ib tug unbiased kwv yees uas muaj qis variance dua lwm yam unbiased kwv yees rau tag nrho cov txiaj ntsig tau ntawm qhov ntsuas.

Puas muaj ntau yam kev kwv yees tsis ncaj ncees?

Tus naj npawb ntawm cov kwv yees yog suav tsis txheeb vim R muaj lub cim ntawm qhov txuas ntxiv. Thiab qhov ntawd tsuas yog ib txoj hauv kev kom tau txais ntau qhov kev kwv yees tsis ncaj ncees. Yog li tus kwv kwv tsis ncaj ncees.

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