Quote from makloda:
Clearly trying to dissect Niederhoffer's opinion on trendfollowing is a waste of time
I have to say I underestimated VN level of intelligence and understanding, probably due his past failures, frequent arrogance and his connection with a certain ET poster who always seemed more interested in getting attention than anything else
But he does makes interesting points, lots of things he says can't countered at all. Some of them can, like this one
"Dave: Are you able to support this view with actual numbers?
Victor: In my book Education of a Speculator, I report that the correlation between weekly stock price changes in the S&P futures during the 1990's is approximately -0. 08. The correlation between daily changes is approximately -0.04 over almost all relevant periods. The chances of a rise following a series of 2, 3, 4 or more consecutive declines, in stocks, is approximately 10% higher than normal. Therefore, trend followers in the stock market averages would appear to be playing in a game heavily stacked against them. "
What he seem to be missing is that correlations dont tell you about the 'magnitude' of the moves, lets say one buys one day because it seems that a large up trend is about to start. Even though the correlation would be negative and is likely the market will mean revert in case it doesnt you might be able to capture a large move(above the long-term upward drift in the market) that offsets the initial slighly unfavorable odds
The correlations dont tell you about the mathematical expectation, although it can affect it
However he is right that one cant say 'this has been a 60% rally and the trend is up, its more likely the market will rise tomorrow after adjusting for its natural tendency to go up', that is not right since the market has a tendency to mean revert. However one CAN say 'assuming that momentum inefficiency doesnt go away(assuming it exists), being long in the monster rally has a higher expectation than short, even adjusting for the updrift tendency of the stock market'