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Video: Post hoc rhiab heev tsom xam yog dab tsi?
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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Soj ntsuam kev nkag siab yog ncej - hoc tsom xam uas qhia peb tias peb cov txiaj ntsig zoo li cas. Nws tuaj yeem muab cov ntaub ntawv tshwj xeeb ntawm: Cov kev xav twg yog qhov tseem ceeb, thiab lawv cuam tshuam rau kev tshawb fawb ntau npaum li cas, Cov kev hloov pauv hauv cov qauv, cov qauv, lossis cov txiaj ntsig ntawm qhov ntsuas tsis tau ntsuas cuam tshuam rau cov txiaj ntsig.
Tib neeg kuj nug, lub ntsiab lus ntawm post hoc tsom xam yog dab tsi?
Ncej - hoc (Latin, lub ntsiab lus “ tom qab qhov no”) txhais tau tias rau txheeb xyuas cov txiaj ntsig ntawm koj cov ntaub ntawv sim. Lawv feem ntau ua raws li tsev neeg qhov yuam kev; qhov tshwm sim ntawm yam tsawg ib yam Kuv ua yuam kev hauv pawg (tsev neeg) ntawm kev sib piv. Feem ntau ncej - hoc xeem yog: Bonferroni txheej txheem.
Tsis tas li, dab tsi yog kev tshaj tawm pawg pawg hoc tsom xam? Hauv kev tshawb fawb, post hoc tsom xam (los ntawm Latin pos hoc , " tom qab qhov no ") suav nrog kev txheeb cais tsom xam uas tau teev tseg tom qab cov ntaub ntawv tau pom. Qhov no feem ntau tsim teeb meem kev sim ntau yam vim tias txhua qhov muaj peev xwm tsom xam yog qhov kev xeem zoo.
Ib tug kuj yuav nug, dab tsi yog rhiab heev tsom xam thiab nws lub hom phiaj yog dab tsi?
Soj ntsuam kev nkag siab yog a qauv nyiaj txiag uas txiav txim siab yuav ua li cas cov phiaj sib txawv raug cuam tshuam los ntawm kev hloov pauv hauv lwm qhov kev hloov pauv uas paub tias yog cov lej hloov pauv. Cov qauv no tseem raug xa mus ua dab tsi-yog lossis simulation tsom xam . Nws yog a txoj kev kwv yees cov qhov tshwm sim ntawm a kev txiav txim muab a qee qhov kev hloov pauv.
Dab tsi yog qhov piv txwv rhiab tsom xam?
Ib qho yooj yim piv txwv ntawm rhiab tsom xam siv hauv kev lag luam yog ib qho tsom xam ntawm cov txiaj ntsig ntawm kev suav nrog qee cov ntaub ntawv hauv lub tuam txhab kev tshaj tawm, sib piv cov txiaj ntsig kev muag khoom los ntawm kev tshaj tawm uas txawv tsuas yog tias lawv suav nrog cov ntaub ntawv tshwj xeeb.
Pom zoo:
Koj xam qhov rhiab heev los ntawm qhov tshwj xeeb li cas?
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Kev suav xam cuam tshuam Tus nqi cuav (α) = hom I yuam kev = 1 - qhov tshwj xeeb = FP / (FP + TN) = 180 / (180 + 1820) = 9% Tus lej tsis raug cuav (β) = hom II yuam kev = 1 - rhiab heev = FN / (TP + FN) = 10 / (20 + 10) = 33% Hwj chim = rhiab heev = 1 - β
Dab tsi yog qhov tshwj xeeb zoo thiab rhiab heev?
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Feem ntau, cov kev ntsuam xyuas rhiab heev muaj qhov tshwj xeeb tsawg. Hauv lwm lo lus, lawv yog qhov zoo rau kev kis tus mob tiag tiag tab sis lawv kuj tuaj nrog qhov ua tau zoo ntawm qhov ua tsis raug. Mammograms yog ib qho piv txwv ntawm kev ntsuam xyuas uas feem ntau muaj qhov rhiab heev (txog 70-80%) thiab qhov tshwj xeeb tsawg
Dab tsi yog qhov tshwj xeeb thiab rhiab heev hauv kev thim rov qab logistic?
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Ob qhov txiaj ntsig no hu ua Kev Ruaj Ntseg thiab Tshwj Xeeb. Qhov rhiab heev = d/(c+d): Qhov feem ntawm qhov pom zoo uas tau kwv yees tias yuav zoo. Qhov tshwj xeeb = a/(a+b): Kev faib ua feem ntawm qhov tsis pom zoo uas tau kwv yees tias yog qhov tsis zoo
Dab tsi yog rhiab heev hauv psychology?
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Rhiab heev. rhiab heev yog lub zog ntawm lub peev xwm los soj ntsuam thiab cais stimuli. Nws yog qhov muaj zog npaum li cas qhov kev nkag siab ntawm kev txhawb nqa yog nyob hauv tus kheej. Ib tus neeg uas muaj kev nkag siab siab dua yuav pom qhov kev txhawb zog ntau dua ntawm qib qis dua li ib tus neeg uas tsis nkag siab rau qhov kev txhawb nqa
Yuav ua li cas koj xam qhov tseeb ntawm rhiab heev thiab tshwj xeeb?
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Qhov tseeb = (rhiab heev) (kis tau tus mob) + (tshwj xeeb) (1 - kis tau tus mob). Tus lej tus lej ntawm qhov raug yog qhov piv txwv ntawm cov txiaj ntsig tau zoo (qhov tseeb qhov zoo thiab qhov tsis zoo muaj tseeb) hauv cov pej xeem xaiv. Qhov tseeb ntawm 99% ntawm lub sij hawm qhov kev ntsuam xyuas yog qhov tseeb, tsis hais qhov zoo lossis qhov tsis zoo