市場的最佳的投資組合是不是不只一種? - 股票

By Franklin
at 2019-08-16T14:56
at 2019-08-16T14:56
Table of Contents
最近把 投資組合理論和CAPM 好好研究了一下
假設我任選n隻股票來近似所謂的大盤
(market portfolio的概念)
這n隻股票會有 (X1,X2,...Xn) 的係數排利組合
等於會有很多組解
但如果用夏普率去篩選 我們可以選出最高的5組
n 也可以前後變化一下 n-5 < n' < n + k
所以k選 5好了
這樣就有 50組不同的投資組合
這是不是一個很簡單的策略了啊?
一般來說 n=10 就能夠很有效的分散風險了
不過
台股有超過一千支股票
怎麼從這1000支選出最好的十支呢?
概念看幾來很簡單
實際操作上好像還是很複雜
有人有經驗的嗎?????
而且如果你用n=10 去組成market portfolio
這跟原本的大盤表現的誤差部分是不是也要考慮進去呢?
另一個問題
n取太大 雖然會近似原本大盤 但會部會衍生出過擬合的問題來呢??
所以目前瓶頸似乎在
怎麼用最少的成分股去擬和出大盤表現的同時
又不能造成過擬和化的狀況
這絕對有很多技術成分在裡面啊!!
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