木同學(xué)
2022-11-16 17:47為什么選B
Select stocks from investment universe to build an indexed portfolio. Which of the following sampling method is most likely used? A.?????? sample random sampling B.?????? stratified random sampling C.?????? systematic sampling
所屬：CFA Level I > Quantitative Methods 視頻位置 相關(guān)試題
來源： 視頻位置 相關(guān)試題
1個(gè)回答
Evian, CFA助教
2022-11-16 18:07
該回答已被題主采納
ヾ(?°?°?)??你好同學(xué)，
Stratified random sampling (known as proportional random sampling or quota random sampling) involves the division of a population into smaller sub-groups known as strata. The strata are formed based on members' shared attributes or characteristics such as income or educational attainment.
分層抽樣：一個(gè)總體分分組，每個(gè)組抽抽樣，例如，調(diào)查中國(guó)人的平均收入，此時(shí)如果只在中關(guān)村附近抽樣很可能樣本均是高收入，此時(shí)可以按照不同的地區(qū)抽樣，這樣的方法可以使得樣本中的個(gè)體差異化較大，估計(jì)總體時(shí)更為準(zhǔn)確。
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