地特統計三等閒聊區 - 考試
By Jacky
at 2013-12-22T19:04
at 2013-12-22T19:04
Table of Contents
想問問大家抽樣寫的怎麼樣
考試前硬塞了一堆複雜公式
結果考卷一眼望去都是基本題
結果我居然沒算完QQ
想討論的是第三題沒給M
大家都怎麼算呢?
我是想說用"比率群集"
至少平均數的估計值就可以用不到M
第二小題在弄本來的群集公式算
是說沒給M的話,我看二馬的書是先算小m bar然後乘以N,當作大M的估計值
然後我看王瑋的書則是直接就在分母寫"M",所以算出答案會是xxx/M
(註:王瑋我是看100年版的,不知他後來有沒有換其他方法?)
兩者我都覺得很怪,就決定比率群集了
結果標準誤來不及算...
第三小題算n我算出來等於20
感覺是算錯了...
然後想問一下我第四題算出來回歸的標準誤居然比比率還大
那是不是表示一定掰了QQ?
那題我 Sxy 按四次計算機結果都不一樣QQ
已哭
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