A.定基指數(shù)和環(huán)比指數(shù) B.數(shù)量指標(biāo)指數(shù)和質(zhì)量指標(biāo)指數(shù) C.個(gè)體指數(shù)和總指數(shù) D.綜合指數(shù)和平均數(shù)指數(shù)
A.r=0 B.|r|=1 C.-1
A.簡單隨機(jī)抽樣B.類型抽樣C.等距抽樣D.整群抽樣