Nyob rau hauv qhov tshwm sim thiab kev txheeb cais, kev nco tsis nco yog ib qho khoom ntawm qee qhov kev faib ua feem. Nws feem ntau yog hais txog cov xwm txheej thaum qhov kev faib tawm ntawm "lub sijhawm tos" kom txog rau thaum qee qhov xwm txheej tsis nyob ntawm seb lub sijhawm tau dhau mus lawm.
Lub ntsiab lus ntawm kev nco tsis muaj dab tsi?
lim. (probability theory) Ntawm qhov kev faib tawm qhov tshwm sim, xws li qhov ua tau tshwm sim los ntawm cov txheej txheem random qauv yog qhov txawv thiab tsis muaj ntaub ntawv(piv txwv li "nco") ntawm cov qauv ua ntej.
txhais li cas hais tias qhov kev faib tawm tsis nco qab?
Kev faib tawm tsis nco qab vim yav dhau los tsis muaj kev cuam tshuam rau nws tus cwj pwm yav tom ntej Txhua lub sijhawm tam sim no zoo li qhov pib ntawm lub sijhawm tshiab random, uas muaj tib yam kev faib tawm txawm tias lub sijhawm tau dhau mus npaum li cas. Tus exponential tsuas yog qhov tsis nco qab tsis tu ncua random sib txawv.
Koj ua pov thawj li cas tsis nco txog khoom?
A geometric random variable X muaj cov khoom tsis nco yog tias rau tag nrho cov lej tsis muaj txiaj ntsig s thiab t, cov kev sib raug zoo hauv qab no tuav. Qhov tshwm sim muaj nuj nqi rau qhov sib txawv geometric random sib txawv X yog f(x)=p(1−p)x Qhov tshwm sim uas X ntau dua lossis sib npaug rau x yog P (X≥x)=(1−p)x.
Yog cov khoom tsis nco?
Qhov xaus ntawm feem ntau ntawm cov kev tshawb fawb no yog cov nqi khoom lag luam yog "yuav luag" tsis nco qab, hauv kev nkag siab tias kev faib khoom ntawm cov nqi lag luam yav tom ntej qhia me ntsis kev vam khom rau yav dhau los realizations, Txawm hais tias ob peb qhov tsis txaus ntseeg tseem nyob.
