There are multiple threads that marketsurfer started regarding the existence of stock trends.
If you get 9 heads in a row when flipping a coin, are you in a heads trend?
For those of you who are stat inclined--- Any trend that exists can be quantified and its departure from randomness can be measured with the usual statistical procedures, such as confidence intervals and likelihoods. Serial correlation coefficients, regression coefficients of current changes versus past changes, and magnitudes of the impact of past moving averages on the future, distributions of the length of runs, the correllelogram, the expected waiting times between peaks and valleys, survival statistics. All these techniques are very good at discovering any non-random elements.
None of these indicate trending behavior in the stock market. Trends do exist in other markets but not stocks.
surf
If someone is trading a system they call trend trading profitably, does it matter? I know a guy that was trained by one of the guys in the Market Wizards book. They both define the system as trend trading. The guy I know made a shit ton of money. He ended up running a sizable fund and sold it. Now he owns an investment bank.
I personally know another guy who trend trades. He defines his system as trend trading. He has made all of his money from trading. He lives in a $20m house on the beach.
So you can argue all day if there are trends or not however you define them. Those two guys don't care if you think there are trends or not.
