Cov lus tsis sib xws thiab independent yuav raug siv sib hloov ua lus Askiv, tab sis lawv tsis yog lus piv txwv hauv lej. Independent random variables are uncorrelated, but uncorrelated random variables tsis yog ib txwm ywj siab.
Puas yog qhov tsis muaj kev cuam tshuam ib txwm muaj kev ywj pheej?
raug muab faib ua ke kom txhua tus ib leeg tsuas yog feem ntau faib, thiab tsis sib txheeb, tab sis lawv tsis ywj pheej; piv txwv yog muab hauv qab no. …
Vim li cas tsis sib txheeb tsis txhais tias muaj kev ywj pheej?
Vim qhov kev sib raug zoo yog qhov ua haujlwm tas mus li ntawm c, qhov nruab nrab tus nqi theorem txhais tau tias muaj qee qhov tshwj xeeb ntawm c uas ua rau kev sib raug zoo 0. Tus nqi ntawd yog kwv yees li 1.54. Nyob rau hauv tas li ntawd, X thiab Y yog uncorrelated, tab sis lawv qhia meej tsis muaj kev ywj pheej, vim X txiav txim siab tag nrho Y.
Puas yog Bernoulli hloov pauv tsis muaj kev ywj pheej?
Identally distribution, uncorrelated, Bernoulli rvs yog ywj pheej.
Puas yog ob qhov kev hloov pauv tsis sib xws ua tau ywj pheej?
Ntxiv mus, ob qhov sib koom ua ke ib txwm faib cov sib txawv sib txawv yog ywj pheej yog tias lawv tsis sib xws, txawm tias qhov no tsis tuav rau qhov hloov pauv uas nws qhov kev faib tawm marginal yog qhov qub thiab tsis sib txheeb tab sis nws qhov kev faib tawm tsis sib xws kev sib koom ua ke ib txwm (saib Feem ntau faib thiab tsis sib txheeb tsis hais txog kev ywj pheej).
