Quote from travis:
John, thanks for the advice. I know you are right in saying that the trend is caused by the news. Yet, those people saying "it's all in the chart" are also right, because you said it yourself that price is influenced by the news. So if you look at price you see the news in it.
Now the objection of course will be that you have to wait until it's too late in order to see the news in the chart, whereas by knowing which news causes trend, you could forecast it. This is true. Knowing what news is a market mover will give you an edge, provided that you do know which news is and which is not.
Yet there is also a big disadvantage in watching the news. First of all, you could be wrong in predicting which news will be a market mover. Second of all, it's practically impossible to create an automated system (entirely automated) that gives you an estimate of future trend or range based on what news will be released, at what hour, and on which day. Or at least, personally, I can't create a system that browses the web, gathers information about dates and times of what news, and decides whether it's important.
In my opinion, for an automated system, observing pre-open or "first half hour" data is the only possible way to predict whether today will be trend or range. And it might be even more accurate, because of what I mentioned about the possibility of being wrong about judging the importance of news (whereas if nothing happens on the chart after the news is released you know for sure that the news was irrelevant).
Say that at 8.30 AM, as it often happens, important news is released and the market moves a lot. My system will pick it up by observing an unusually high pre-open range, and since it doesn't start trading until 9.30 anyway, it will be able to choose the right type of trading by that time. There might be a problem for the news released at 10.00. Maybe I will adapt it, and postpone trading until then. But probably for those few days that it happens, it's not worth changing the whole system.