Granger ua dab tsi?

Cov txheej txheem:

Cov kauj ruam yooj yim rau kev khiav qhov kev xeem yog:

Video: Granger ua dab tsi?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

A zaub xam lav yog ua teb. Yog koj xav ua ib tug zaub xam lav muaj ib hnub, koj yuav tau txais ib txoj hauj lwm nyob rau hauv ib tug ua liaj ua teb mis nyuj los yog mus rau lub tsev kawm ntawv ua liaj ua teb. Thaum lub xyoo pua kaum ob lo lus zaub xam lav tsis tau siv ntau hnub no, nws yog ib txoj hauv kev los xa mus rau ib tus neeg ua liaj ua teb nyob rau xyoo 1800s Tebchaws Meskas.

Tsuas yog li ntawd, vim li cas Granger causality tseem ceeb?

Cov Granger causality test yog ib tug statistical hypothesis xeem rau kev txiav txim siab seb ib lub sij hawm series puas muaj txiaj ntsig hauv kev kwv yees lwm qhov. Yog tias tus nqi yuav muaj tsawg dua li qib α, ces qhov kev xav yuav raug tsis lees paub ntawm qib ntawd.

Qhov thib ob, muaj pes tsawg lags nyob hauv Granger causality? Qhov siab tshaj ntawm kaum ob lags tau txiav txim siab rau txhua qhov sib txawv hauv kev txiav txim siab cov no lag specifications. * SlgniElcance ntawm qib 5 feem pua. F-tests yog qhov tseem ceeb, qhia Granger causality los ntawm Y rau M1, rau FPE- thiab PH- txiav txim siab lag cov qauv.

Yog li ntawd, Granger ua rau txhais li cas?

Granger causality yog ib lub tswv yim kev txheeb cais ntawm causality uas yog raws li kev kwv yees. Raws li Granger causality, yog lub teeb liab X₁ " Granger - ua rau "(los yog "G- ua rau ") ib signal X₂, ces yav tas los qhov tseem ceeb ntawm X₁ yuav tsum muaj cov ntaub ntawv uas pab kwv yees X₂ saum toj no thiab tshaj cov ntaub ntawv muaj nyob rau hauv yav dhau los tus nqi ntawm X₂ ib leeg.

Koj sim Granger causality li cas?

Cov kauj ruam yooj yim rau kev khiav qhov kev xeem yog:

Qhia qhov null hypothesis thiab alternate hypothesis. Piv txwv li, y(t) tsis Granger-ua rau x(t).
Xaiv cov lags.
Nrhiav qhov f-tus nqi.
Xam cov f-statistic siv cov kab zauv hauv qab no:
Tsis lees paub qhov null yog qhov F statistic (Qib 4) ntau dua qhov f-tus nqi (Qib 3).

Pom zoo:

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