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Can daily data cut it?

Not that long ago a had a question about everyone's experience with the estimation of expected returns, since I had found it very difficult to tap around completely in the dark as to which approaches in general can produce competition-grade and fund-grade algorithms, and I was very grateful to have received some very thoughtful replies.

I pointed out then I understand very well now that no-one should be expected to reveal their success secrets, but I hope that you do not mind if I ask for another general guideline that I find crucial -- and then I'll never do it again, you have my word.

The question I have is whether in your opinion and in light of the importance of the Sharpe ratio, as described in the latest Q blog entry, for example, algorithms working with daily data can count on any sort of success, or whether is one virtually obliged to work with minutely data and the (sub)-daily trading frequency.

Sincerest thanks in advance for your comments.

2 responses

Hello Tim,

The short answer is that yes, you absolutely can have a daily algorithm selected for use in the fund.

I'd like to rephrase your question before I give the longer answer. The key aspect that Jonathan is talking about is better described as bet frequency rather than data frequency. In terms of data frequency, Quantopian provides data on a number of frequencies. Price data, for instance, is minutely, some data sources are daily, and some, like many corporate financials, are quarterly. You can use any of these data sources as inputs in your algorithm.

So, I'd phrase your question this way: "Is it possible for an algorithm that does daily rebalancing to find success on Quantopian?" And the answer is, absolutely, yes.

Going a bit further, your algorithm needs to do more than just check the price every day. It needs to make decisions every day. As a simple example, for most stocks, the 300-day moving average changes direction infrequently. You might check that price every day, but you're only trading once or twice a day. That algorithm isn't going to be selected for an allocation.

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Thank you very much, Dan, for your encouraging answer, and for rephrasing my question the right way. I am sorry for the confusion that its initial formulation may have presented to the reader. It all has to do with the fact that English is not my mother tongue.

Reaching the very end of your text, though, I get a bit uncertain myself, when you say "You might check that price every day, but you're only trading once or twice a day. That algorithm isn't going to be selected for an allocation." To my untrained, non-native speaker ear this sounds a bit contradictory. Did you perhaps mean to say " ... but you only trade once or twice a week (or month)." ?

My apologies if I got this one wrong as well. And in any case sincerest thanks again for restoring my belief in daily trading and data.