Vim li cas peb thiaj li yuav tsum tau sim rau qhov chaw nres tsheb?

Cov txheej txheem:

Vim li cas peb thiaj li yuav tsum tau sim rau qhov chaw nres tsheb?
Vim li cas peb thiaj li yuav tsum tau sim rau qhov chaw nres tsheb?
Anonim

Yog li kev sim rau qhov chaw nres tsheb tseem ceeb heev vim tag nrho cov txiaj ntsig ntawm kev thim rov qab tuaj yeem tsim tawm. … Nyob rau hauv txoj kev cai lub series hu ua nyob ruaj ruaj yog hais tias nws txaus siab rau peb tej yam kev mob, txwv tsis pub nws yuav yog ib tug tsis-station series.

Vim li cas peb sim rau qhov chaw nyob hauv lub sijhawm?

Lawv tsuas tuaj yeem siv los qhia txog qib rauuas qhov kev xav tsis zoo tuaj yeem raug lees paub lossis tsis lees paub. Qhov tshwm sim yuav tsum tau muab txhais ua qhov teeb meem kom muaj txiaj ntsig. Txawm li cas los xij, lawv muab kev kuaj xyuas sai thiab pov thawj pov thawj tias lub sijhawm ua haujlwm nyob ruaj khov lossis tsis nyob ruaj khov.

Kev sim rau qhov chaw nyob yog dab tsi?

Nws muaj ob txoj hauv kev sib txawv: kev ntsuas kev nyob ruaj khov xws li qhov KPSS qhov kev sim uas suav tias yog qhov kev xav tsis zoo H0 uas cov koob yog nyob ruaj ruaj, thiab ntsuas hauv paus hauv paus, xws li Dickey- Fuller test thiab nws cov augmented version, augmented Dickey-Fuller test (ADF), los yog Phillips-Perron test (PP), uas qhov null …

Koj puas xav tau kev sim rau qhov chaw nyob hauv lub sijhawm cov ntaub ntawv?

Ntaus, yes. Yog tias koj muaj qhov sib txawv thiab lub caij nyoog hauv koj lub sijhawm series, tom qab ntawd ua qauv rau cov khoom no, tshem tawm lawv los ntawm kev soj ntsuam, ces cob qhia cov qauv ntawm cov seem. Yog tias peb haum tus qauv nyob ruaj ruaj rau cov ntaub ntawv, peb xav tias peb cov ntaub ntawv yog kev ua tiav ntawm cov txheej txheem nyob ruaj khov.

Vim li cas peb thiaj kuaj tau ib lub hauv paus?

Unit root tests yog kev xeemrau kev ruaj ntseg nyob rau hauv ib lub sij hawm series. Lub sij hawm series muaj nyob ruaj khov yog tias lub sijhawm hloov pauv tsis ua rau muaj kev hloov pauv hauv cov duab ntawm kev faib khoom; cov hauv paus hauv paus yog ib qho ua rau tsis muaj chaw nyob. Cov kev ntsuam xyuas no paub txog muaj lub zog ntsuas qis.

Pom zoo:

Nthuav cov khoom
Thaum twg peb lub pas dej tauv tsim?
Nyeem ntxiv

Thaum twg peb lub pas dej tauv tsim?

Peb lub Gorges Dam yog lub pas dej loj loj uas hla tus Dej Yangtze los ntawm lub nroog Sandouping, hauv Yiling District, Yichang, Hubei xeev, nruab nrab Tuam Tshoj, nqes ntawm peb Gorges. Peb Gorges Dam tau ua lub chaw nres tsheb loj tshaj plaws hauv ntiaj teb raws li kev teeb tsa muaj peev xwm txij li xyoo 2012.

Puas yog acetamide muaj ntxhiab tsw?
Nyeem ntxiv

Puas yog acetamide muaj ntxhiab tsw?

Cov tshuaj acetamide yog cov tshuaj acetic acid-derived uas tau txheeb pom tias yog tsw zoo li ammonia lossis vinegar. Nws tseem yuav cling rau qhov chaw uas musculus nyob rau hauv pw tsaug zog thiab yuav tau txais zaub mov scrounge. Vim li cas acetamide yaj hauv dej?

Kuv puas tau mob plawv?
Nyeem ntxiv

Kuv puas tau mob plawv?

Feem ntau, lawv tshwm sim los ntawm kev ntxhov siab thiab kev ntxhov siab, lossis vim tias koj tau muaj caffeine, nicotine, lossis cawv ntau dhau lawm. Lawv kuj tuaj yeem tshwm sim thaum koj cev xeeb tub. Muaj tsawg zaus, palpitations tuaj yeem yog ib qho cim ntawm lub plawv mob hnyav dua.