今天有位同學問我，
技術指標背離代表什麼意思 ?
A student asked me today what does the deviation mean ?
技術指標設定下限為 0 ，
股價再怎麼跌，指標最低跌到 0 ，
不會變負的 ，
所以跌到後來指標就鈍化，
即所謂的技術指標背離。
The lower limit of technical indicators is set to 0.
No matter how stock price drops, the indicator will not become negative when the lowest point drops to zero.
Therefore, the indicator becomes blunt after falling, which is the so-called deviation from the technical indicator.
這是公式設定必然的道理，
而非隱含了什麼不為人知的市場轉變。
This is the result set by the formula,
rather than implying some unknown market changes.
只要把下限拿掉，
讓下跌可以跌到負的或無限，
就不會出現指標背離。
數學不太差的人都能理解這個道理。
Just remove the lower limit,
let the decline fall to negative and infinite,
there will be no indicator deviation.
People who are not very good at math can understand this fact.
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