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Random Forest Classification

This was more about testing the concept than anything else--in a real production I would want to check the amount of money I have, make sure that I don't have conflicting trades, etc.

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Backtest from to with initial capital
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# Backtest ID: 5542b7aa29c3d90d2422784c
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5 responses

Brett, thanks for posting. Looks really interesting and I think exploring random forest classifiers is an interesting avenue.

In case you want to retrain the model you could use the schedule_func() functionality. Moreover, it would be cool to somehow track the number of correct predictions to see if it actually filters out any signal. I know this is mainly meant as a framework for blackbox algorithms but those metrics would also be useful irrespective of the way the ML algo is trained.


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Brett, why are you applying a ML algo on one stock?

@Thomas Thanks, I'll look into that, there are always new functions here for me to explore
@Aaron mostly because this is for coursework, and is more of a proof of concept than an actual implementation--if you look at the code you can see that I set i=0--the reason is that it would make it easy later to iterate through a list of stocks. I definitely will play with this concept more, but I really just wanted to get a working implementation out there. I also figured I'd share my work, because I always get great comments on how I can improve what I've got out there.

Sorry, but it seems to me that this algo is fundamentally wrong (= no correlation between the random forest prediction and results). I have just found this algo and at first look it was an interesting concept, but I have added just some log print and it shows:
- prediction is -1 on 08/16/2011, 08/17/2011, 08/29/2011, 11/10/2011 and +1 on 09/13/2011
- prediction is 0 on all other days, so most of the time
- leverage is continuously growing, at the end it equals 3.4288486196
- position amount is 90960 at the end

The problem is that after the first -1 prediction + 5 days the "Iterate through and sell stocks that need to be sold" part starts executing and never stops. It continuously buys 20 stock in every day from that time. So the result is caused by this part of the algo and not the random forest.

Another interesting insight if you print out the feature importances of trainig set ( ):
[ 0.0226167 0.02402722 0.03290289 0.03810386 0.03319766 0.05443647 0.04481815 0.02837444 0.02219877 0.03530863 0.02546308 0.03016573
0.02440857 0.03986063 0.01865393 0.02430047 0.03319342 0.0348683
0.04663834 0.03969558 0.05259424 0.02008375 0.05023988 0.036746
0.03870388 0.04181752 0.0436984 0.03384612 0.02903738]

mean | 0.03442
median | 0.0338
sample standard deviation | 0.009821

This means 30 days history prices importance is more or less equally distributed as you expect. There is no real prediction power based on history prices.

Thanks for the input--this was definitely far from ideal implementation--it was done for a homework assignment.