snowrider 发表于 2012-3-18 11:06
一個較簡單的判斷方式就是 只計算平均振福 (volatility) 但是這同樣有 variable - for example, how many ...
當一段時間 (e.g., 20 days) 的平均振福計算出來之後
想走停損路線的同學 -
可以決定要講停損放至於 平均振福乘以 X 倍 之後 (e.g., X=2.0). The assumption is that if the market is still in the current trend, its pullback should not be more than that amount. If it does happen, the trend changes.