作者查詢 / yanchenglin
作者 yanchenglin 在 PTT [ Math ] 看板的留言(推文), 共45則
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2F→:你的MLE算錯,那個答案是對一次方微分,你對二次方微分04/01 23:27
3F→:拍謝!沒錯 我累了@@04/01 23:30
4F推:μ的問題,已知=>變異數MLE不偏. 未知=>變異數MLE偏04/01 23:38
1F推:Xi Xj 獨立 => Cov(Xi,Xj)=0 for all i=\=j02/26 11:38
1F→:簡單講:Z W 若要滿足正負無窮大,角度只要0~π,極座標10/03 01:24
2F→:只有半圈,但你的X Y 要一圈才能滿足(角度0~2π),你才10/03 01:26
3F→:半圈,請乘2補足整圈.1-1含數才能這樣看,2-1要分段寫10/03 01:27
4F→:講錯><" 1-1含數沒此問題 |J|就幫你解決 非1-1才有10/03 01:36
5F→:實際上:極座標世界 到 Z W世界有兩條路徑 (2對1問題)10/03 01:44
6F→:所以有兩組Jacobian轉換,只是這兩個長一樣,變成*210/03 01:46
1F推:MGF微分 用定義建議轉成"失敗"負二項求 再轉回來10/03 02:22
3F推:(a)給hint:Stirling方程,你用t分配的pdf for n->∞09/20 00:36
4F→:會跟N(0.1)的pdf一樣.Stirling幫你處理Gamma的極限09/20 00:37
5F→:(b)Vn converges to Exp(1) in distribution.基本題09/20 00:38
3F推:1+e^(-1)09/16 23:30
7F→:那就是1-e^(-1)啦.看e^x那泰勒展開就有答案嚕09/16 23:36
1F→:這答案爆醜 http://d.pr/i/Yw59 相加大約6.7664~~~09/16 23:50
1F→:Ti~iid~EXP(入) => T=T(1):first order ~ EXP(n入)09/16 18:54
2F→:假如我英文沒會錯意的話,是這樣.@@09/16 18:55
5F→:忘了說我let E(Ti)=1/入=beta.看是頻率還週期.指數分09/16 23:20
6F→:配.If Ti~iid~Exp(a),then nT~Exp(a),T:first order09/16 23:22
7F→:a=參數,看你取單位週期或是單位頻率.答案建議寫pdf式09/16 23:23
14F推:Hogg Example 5.4.1 用t算平均數,有講unknown變異數09/13 23:22
15F→:有些題像Example 5.4.3只有講sample variance S^209/13 23:24
16F→:基本上母體變異數未知,只知道樣本變異數,所以才用T09/13 23:25
6F推:7.5,小五小六補習班鬼方法我不知道,小鬼應該想不到09/11 00:36
7F→:應該是一直分割,發現面積互補,藍色剛好全部四分之一09/11 00:37
8F→:我令邊長A,藍色(1+根號2)*A^2,30=cot(22.5度)*2*a^209/11 00:41
9F→:cot(22.5度)=1+根號2 有沒有人要去捷運站貼答案XD09/11 00:42