Video: Dab tsi yog qhov tshwj xeeb thiab rhiab heev hauv kev thim rov qab logistic?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Ob qhov txiaj ntsig no hu ua Rhiab heev thiab Qhov tshwj xeeb . Rhiab heev = d/(c+d): Kev faib ua feem ntawm kev 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.
Hauv txoj kev no, dab tsi yog qhov tshwj xeeb hauv kev thim rov qab logistic?
Qhov tshwj xeeb (tseem hu ua qhov tsis zoo qhov tseeb) ntsuas qhov feem ntawm qhov tsis zoo uas raug txheeb xyuas kom raug (xws li, feem pua ntawm cov neeg noj qab haus huv uas raug txheeb xyuas kom raug raws li tsis muaj tus mob), thiab ntxiv rau qhov tsis raug qhov tseeb.
Tseem Paub, qhov rhiab heev thiab qhov tshwj xeeb hauv R yog dab tsi? Xam Rhiab heev , Qhov tshwj xeeb thiab kwv yees qhov tseem ceeb Tus rhiab heev tau txiav txim siab raws li kev faib ua feem ntawm cov txiaj ntsig zoo tawm ntawm cov naj npawb ntawm cov qauv uas tau ua tau zoo. Ib yam li ntawd, thaum tsis muaj qhov tshwm sim tsis zoo, tshwj xeeb tsis tau txhais thiab tus nqi ntawm NA raug xa rov qab.
Ib yam li ntawd, nws tau nug, qhov tshwj xeeb thiab kev nkag siab yog dab tsi?
Hauv kev kuaj mob, kuaj rhiab heev yog lub peev xwm ntawm kev sim ntsuas kom raug txheeb xyuas cov neeg muaj tus kab mob (tus nqi zoo tiag), qhov kev sim tshwj xeeb yog lub peev xwm ntawm kev sim ntsuas kom raug txheeb xyuas cov uas tsis muaj tus kab mob (tus nqi tsis zoo tseeb).
Dab tsi yog qhov rhiab thiab qhov tshwj xeeb hauv qhov tsis meej pem matrix?
Rhiab thiab Tshwj Xeeb Peb faib tus naj npawb ntawm qhov tseeb zoo los ntawm tus lej ntawm txhua qhov xwm txheej zoo hauv cov ntaub ntawv: cov chav kawm zoo tshwm sim kwv yees raug (TP) thiab cov xwm txheej hauv chav kawm tau kwv yees tsis raug (FN).
Pom zoo:
Koj xam qhov rhiab heev los ntawm qhov tshwj xeeb li cas?
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
Cov leeg twg thim rov qab thiab rov qab ko taw?
Tibialis posterior thiab anterior leeg invert taw. Cov fibularis thiab extensor digitorum longus nqaij ntshiv taw (saib daim duab. 16-5)
Dab tsi yog qhov tshwj xeeb zoo thiab rhiab heev?
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
Puas rhiab heev thiab qhov tshwj xeeb hloov pauv nrog qhov ua ntej?
Zuag qhia tag nrho, qhov tshwj xeeb tau qis dua hauv kev tshawb fawb nrog ntau dua. Peb pom muaj kev koom tes ntau dua nrog qhov tshwj xeeb tshaj li qhov ua tau zoo, cuam tshuam tias qhov sib txawv hauv kev kis tau feem ntau yog sawv cev rau kev hloov pauv ntawm tib neeg yam tsis muaj kab mob kev txaus siab
Yuav ua li cas koj xam qhov tseeb ntawm rhiab heev thiab tshwj xeeb?
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