3 stocks: A, B, C and 3 pairs of them: A vs B, A vs C,B vs C;
Now I test each pair of them (one of stock’s change percent minus the other’ s, or saying: buy one and sell the other simultaneous) ,then 3 curves as below picture.
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how shall I know which pair is better for trading ?
Thank you for your reply and expalanation;If a pair were perfectly correlated, your chart would show a flat line. Which pair to trade? Totally depends on your overall strategy. The general idea behind pair trading is to wait for things to get out whack and then you buy/sell or sell/buy and hopefully they reverse. I saw a lot of guys blow up trying to do that with the baby bells....long the large cap and short the small cap. A bull market comes along and the big buys the little. Big goes down and little goes up....a lot. That's just one example. Usually, something fundamental happens but no one sees it at first and the pair just keeps spreading. The trader keeps adding in the hopes a reversal is near, because after all this pair has NEVER done this before. By the time you realize you are wrong, you've lost bundle.
ok, thank you!If you trade pairs, you need to put on both sides at the same time. If you like you can scale in (both sides). So, if a full position is 1000 shares on each side, you can scale in by putting on 100-500 shares at a time. A lot of traders that trade pairs do it as part of core portfolio. They'll take some off when the spread widens/contracts and then put it back on.