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Simply because of the number of uncontrolled variables. Some examples:

(a) each ordinal or cardinal buy/sell order of each market participant; and

(b) the information driving those ordinal/cardinal decisions.

Duc

You've been around a long time

All I've ever seen from you is arguement without

Any positive input to a trading plan or strategy

What is positive input?

Can it not be legitimate questions that create some thought/debate? My questions seek to challenge some of the assumptions inherent in mechanical trading based on historical time series data. If in point of fact these are not assumptions at all, then the challenge can easily be answered. If not, then the assumption that has been made, is potentially a uncontrolled risk or variable that may, under certain or specific conditions bite you.

jog on

duc