Share New Research 
Hey guys,
Does anyone know if there is a way to set the time when your algo's Universe is updated? For example, if I wanted to update my universe right before market open, instead of at midnight.
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Michael Handschuh
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Riley O'Shea
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Travis Teichelmann
Hey Micheal Can please you show me an example of how to use a user defined universe with a custom data source? https://www.dropbox.com/s/qx8hs2q81im9zmu/SymbolToday.csv?dl=1 Thanks so much
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Jared Broad
@Travis - please check out this Github example: https://github.com/QuantConnect/Lean/blob/master/Algorithm.CSharp/CustomDataUniverseAlgorithm.cs
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Travis Teichelmann
@Jared Thank you, I've used that example and got it to work with my custom data. Now I'm trying to get the algorithm to read from my data source five minutes after the market opens, add and then buy the symbol. I Noticed that the example above has
AddUniverse(new PreMarketDailyUsEquityUniverse(UniverseSettings, TimeSpan.FromMinutes(10), dateTime = {but that doesn't work either...The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Michael Handschuh
When you say it 'doesn't work', do you mean it doesn't compile? If so, make sure you copy the PreMarketDailyUsEquityUniverse class from the sample since it's not provided as part of the base engine. If the issue is something different, please attach a sample project and I'll take a look at it.
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Travis Teichelmann
I added all of the code from your example to try and pre-charge the algorithm but I wasn't adding a subscription on initialize. I appreciate the help.
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
James Reilly
@MichaelH,
Do you happen to have or know of an example of executing coarse universe selection at a custom specified time or on initialization? Is this even possible?
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Richard Hamilton
I should be grateful if someone would provide me with the necessary changes to fix the following two errors in the above algo:
Build Error: File: Main.cs Line:71 Column:14 - 'UserDefinedUniverse' does not contain a constructor that takes 4 arguments
Lines 70 & 71 are:
public PreMarketDailyUsEquityUniverse(UniverseSettings universeSettings, TimeSpan timeBeforeMarketOpen, Func<DateTime, IEnumerable<string>> selector) : base(CreateConfiguration(), universeSettings, TimeSpan.MaxValue, selector)Build Error: File: Main.cs Line:80 Column:74 - The call is ambiguous between the following methods or properties: 'MarketHoursDatabase.GetEntry(string, string, SecurityType)' and 'MarketHoursDatabase.GetEntry(string, Symbol, SecurityType)'
Line 80 is:
var marketHoursDbEntry = MarketHoursDatabase.FromDataFolder().GetEntry(QuantConnect.Market.USA, null, SecurityType.Equity);The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Jared Broad
Hi Richard! Glad you're diving into the open source! But we can't do support for that here, please use google groups if possible and attach all your config and sample data so we can replicate the issue:
https://groups.google.com/forum/#!forum/lean-engine
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Quant Trader
@Richard Hamilton: your call to PreMarketDailyUsEquityUniverse does not match the parameters, you pass 4, but 2 are accepted. The other is a casting issue, you can cast with (string) or (Symbol). Can you share your code so I can have a look?
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Richard Hamilton
@Quant Trader, thanks for the comments. The full algo can be cloned from above...it's from Michael Handschuh's reply to the op.
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Quant Trader
this is first fix:
var marketHoursDbEntry = MarketHoursDatabase.FromDataFolder().GetEntry(QuantConnect.Market.USA, (Symbol) null, SecurityType.Equity);second fix under investigation as I set null, but maybe you need to give an interface to an initialized object;
public PreMarketDailyUsEquityUniverse(UniverseSettings universeSettings, TimeSpan timeBeforeMarketOpen, Func<DateTime, IEnumerable<string>> selector) : base(CreateConfiguration(), universeSettings, null, TimeSpan.MaxValue, selector) { _timeBeforeMarketOpen = timeBeforeMarketOpen; }The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Quant Trader
fixed
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Richard Hamilton
@Quant Trader, ty, very much appreciated
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Frank Norman
This would lead to higher performing Alpha Streams. I would add it to the arsenal.
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Andrew martin czeizler
Is this being included in the backtest metrics?
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Jack Simonson
We haven't included it yet into the backtest metrics, but it's something that we're considering as well.
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Tim Bohmann
I would like to see this in the backtest metrics. This would be a quick "sanity test" when backtesting.
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Pangyuteng
Glad to see that Quantconnect seems to be agile and willing to update methods for their algo selection. I also find it comforting that Lean is opensource, so I can check the implementation and their test cases. :)
SPY notebook SR: 0.836, PSR: 50.000% Lean SR: 0.900, PSR: 41.185% ---- SHY notebook SR: 1.237, PSR: 68.901% Lean SR: 1.224, PSR: 69.799% ---- QQQ notebook SR: 0.910, PSR: 52.476% Lean SR: 0.990, PSR: 49.063% ---- AMZN notebook SR: 1.218, PSR: 83.669% Lean SR: 1.339, PSR: 78.661% ---- GE notebook SR: -0.458, PSR: 10.897% Lean SR: -0.306, PSR: 0.159% ----For those that want to do some quick and dirty backtest or optimization/investigation in research, please do keep in mind the inevitable computation differences between LEAN and simple PSR computation in notebook. I think this is one of those little but important things most engineers/data scientists have to deal with when working among different environments. Anyways... per Alexandra's response, "rolling PSR" is computed by LEAN (I can't seem to figure out where the rolling part is though in github), while Jack's PSR is a single value derived from one stream of returns. Below shows you the difference for Sharpe Ratio (SR) and PSR for a few tickers if you buy-and-hold in the same timeframe between notebook (using annualized SR) and Lean. I would expect PSR for SPY to be a bit closer to 50% from LEAN. Avid notebook users... beware!
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Kamer Ali YUKSEL
I would be more than glad if someone can also share how to calculate rolling PSR.
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Kamer Ali YUKSEL
I also have a question, why you haven't utilized Deflated Sharpe Ratio? That seems to be an extension over PSR.
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Jared Broad
DSR was not deterministic, and required analysis of many backtests. PSR was chosen because it could be self contained with a single analysis.
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Kamer Ali YUKSEL
Hello Jared, thanks for letting me know.!I have a small objection about PSR. Since that it uses a long-only SPY benchmark, it does not make perfect sense for long-short portfolios or a long-only ETF portfolio that includes some inverse ETF(s), such as the current universe. I sometimes obtain better results in many of the metrics but the PSR is lower. To sum up, it is not a very good metric in terms of taking the market-neutrality into account (except for a long-only portfolio that does not include any Inverse ETFs - which is not valid for the current competition universe).
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Jared Broad
We chose not to use SPY as the benchmark but a fixed Sharpe-ratio of 1.0 to make the measurement cross-asset / cross-strategy type; so the PSR readings in LEAN's case are the probability the real algorithm returns are greater than 1.0 Sharpe ratio.
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Kamer Ali YUKSEL
Just to let you know, I encountered another implementation of PSR in some other source codes that I have checked. The first one below is that other implementation and the second one below is the implementation in this thread. I did not yet compare the output of those but they seemed to be different to me. I would welcome an advise on this.
std = np.sqrt(1 - (sps.skew(ret)*sharpe) + sharpe**2 * (sps.kurtosis(ret)-1)/4)
return sps.norm.cdf(sharpe * np.sqrt(len(ret)-1) / std)
std = 1 - (sps.skew(ret) * sharpe) + ((sps.kurtosis(ret)-1)/4) * sharpe
return sps.norm.cdf(sharpe / np.sqrt( std / (len(ret) - 1)))
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Rahul Chowdhury
Hey Kamer,
The other implementation of PSR you provided is actually the correct implementation as defined by the paper The Sharpe Ratio Efficient Fronter by Bailey D. & Prado M. (2012). That equation is the one that is defined in LEAN and is the correct one. However, we made a small mistake in copying it over in the journal post, which we've since fixed. There was a missing factor of Sharpe in the kurtosis term. With the added Sharpe factor, the two equations are the same, just differently represented. Thanks for pointing it out!
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Kamer Ali YUKSEL
Hello Rahul, Yeah, I also verified that later but did not want to write it here to make a conclusion :) Thnx!
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Apollos Hill
So i am finally rereading this thread. Sorrry. I know its kind of old now and has been added ot the Alpha criteria. I'm looking for tips on how to increase my PSR past 50 .
" the Probabilistic Sharpe Ratio is an atemporal measure of strategy performance expressed in terms of probability of skill beyond a given benchmark..." If we are using 1.0 Sharpe as a benchmark and not SPY...if my strategy is doing 250% return over a 5 year backtest, how am i only at 25-50% PSR and 0.8 sharpe? IS it suggesting that I somehow am not maximizing the profit potential of my strategy? I don't want to post a backtest here but i am in forex, trading 4 out of the 8 major pairs. I can't trade all the pairs or else i'm over exposed. I'm trading on weekly bars and holding for months using million dollar positions. I'm also in positions as much as i can be without over trading. 250% over 5 years is about 50% annual returns. Is that not worthy of a 1.0 sharpe? I doubt the assets that Ted posted above (with LEan SR thanks) could achieve these returns.
Appreciate the help on increasing my PSR so i can lease this alpha stream.
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Jared Broad
Hi Apollos, it means the volatility of the strategy is too high. Perhaps you can invest smaller, or risk-adjusted positions somehow? Could you invest for shorter periods to help reduce the exposure to swings of the market?
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Apollos Hill
Hi Jared
I tried only investing 1% per trade. I'm in the process of seeing if i can go to daily bars instead of weekly. Right now i have a nice 45degree slope up. It doesn't seem volatile to me. My Annual Variance and my Beta are 0.00. Not sure if that helps you or not. my sharpe is 0.729 so i guess PSR at 25% is saying that i have a 25% chance that my sharpe will be over 1% . So i need to improve my money making, without increasing drawdown, correct? 10% DD on a 48% total return over 5 years. (nowthat i changed to 1% positions)
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Rahul Chowdhury
Hey Apollos,
There is currently an issue with beta calculation for daily resolution data which produces 0 beta for all strategies. The true beta of your strategy may actually be larger. If your strategy is trading the same symbols for the same duration, changing position sizes will not dramatically change your PSR because your returns and drawdowns will scale proportionally. Instead try shortening your insight period or changing how you emit insights.
> my sharpe is 0.729 so i guess PSR at 25% is saying that i have a 25% chance that my sharpe will be over 1%
It means there's a 25% change your live-Sharpe is greater than 1.0; (in part because the backtesting Sharpe is 0.7)
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Ritaelyn
Hi Jared,
What's your thoughts of allowing for a sortino ratio as another means for submission? One thing I'd like to submit to alpha is about 3.60 sortino but it's under 1.0 sharpe, as sharpe unfortunately penalizes both upside and downside volatility equally.
Thanks for considering it!
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
Hector Barrio
Hello Ritaelyn, I agree with you. Any equity trading during the COVID instability will be highly penalized by SR/PSR metrics, even if properly hedged and/or profitable. The normality assumption of the sharpe ratio can, in extreme cases, make very large positive returns in possitively skewed strategies undesirable. It is also a possibilty to have strategies that could "fish" for higher PSR by extending the test period to low volatility-low return periods (cool periods) even at equity loss.
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
.ekz. INVESTOR
+1 to Ritaelyn point. I'd love to see Sortino Ratio. From what I've been reading, sharpe ratio (and subsequently PSR as well) is not the best perf indicator for trend following strategies.
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
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