If I am understanding your post correctly, in part at least, you are dealing with the concept of probability. Prior to when you start counting your number of 'up days' you are not paying any attention to what has happened prior to day 1 in terms of determining whether the stock price is in any kind of trend.
Given that on any given day a stock price can go up, stay the same, or go down. With equal weighting of probability, the chance a stock will go up in price is 33%. So if you have calculated that by using your method you can achieve 50%+ wins, then that is pretty good?
As you are aware Im sure, Trend and Momentum do not necessarily occur together. Trend being the direction, Momentum being the speed, while importantly the other part of the equation, in my opinion, is Gravity, hence the likes of consolidation periods, and pullbacks. I think the idea you have is one where the price keeps going up the longer its been going up, whereas if you think of the stock price as a bouncing ball (its the best I can come up with at this time of night...) If you bounce the ball away from you hard onto the floor, it rises up, quickly at first, but then tapers off as gravity takes a hold, before hitting the ground and taking off again in an upward direction etc....The longer its up in the air the** less** likely it is for it to continue being up in the air without coming down.
A coin as we know has no memory, so statistically it can be flipped for years constantly and each outcome is totally independent of any prior or subsequent outcomes. Something that was touched on in one of the threads earlier this week however, is conditional probablility. I think this may well come into play here because for each additional day the price goes up, the likelyhood of it going up again the following day decreases, as I have just suggested above. This can Im sure be demonstrated statistically, but also consider that unlike the coin flip, sentiment, psychology and a whole load of other factors come in to play with stock prices.
Looking at your thoughts again in your 3rd paragraph. I can see where you are coming from, that each additional day the price goes up is going to confirm a trend. I think your edge, which is seemingly backed up by your spreadsheet is gained by buying a stock that has had the fewer number of updays. Your only consideration is how to screen and choose which ones to buy, which leaves me thinking about stocks for instance that are making new highs? i.e a stock that has gone up in price for one day only, but has also made a new high. Another round of testing maybe...? *
Last edited by IceMan; Jul 15, 2017 at 11:17pm.
Reason: Grammar
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