I have read somewhere, here or elsewhere, that a good trading strategy (short term) is to never go long when the tick is negative and vice versa. Now, trading QQQ for instance, I suppose I should be interested in the Nasdaq tick (TIKQ on Tradestation). However, compared to the the Dow tick, it has been much lower most the time, at least recently (in very negative territory all day today so far, while the Dow tick has been above 0 several times). If I would apply the "good trading strategy" above, with the Nasdaq tick, I would never had gone long today, and by that have missed the nice run from 11:00 to 12:30. Maybe I misunderstood the "trading strategy"? Please, anyone who could fill me in on this?