Question about Coarse Universe Selection and Indicators by Reverb

Reverb

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Hello there! I'm new to QuantConnect and this is my first post. I am trying to figure out how to use coarse universe selection to give me a basket of stocks to work with each day. Specifically I would like to filter stocks by looking at the values of various indicators, kind of like a stock scanner. I found the EMA cross universe selection example which I have been using as a starting point. However, it looks like the CoarseFundamental object has only one price point. Unless I'm missing something, this limits my filtering options when it comes to using indicators. How would I go about filtering by an indicator like ATR (or NATR), which would require more information, specifically the open, close, high, and low?

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Reverb

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Alexandre Catarino

Currently, Coarse Universe selection only have closing price:

class CoarseFundamental {

    public long Volume;          // Traded shares

    public decimal DollarVolume; // Traded shares x Price

    public decimal Price;        // Yesterday close price

    public Symbol Symbol;        // Asset symbol

}

In order to use bar indicators (those that need OHLC), you will need to add securities to the universe. When securities are added and removed from an universe, OnSecuritiesChanged event is triggered and we can make a History Request and update the bar indicator:

private List<Symbol> _allowedSymbols;



public override void OnSecuritiesChanged(SecurityChanges changes)

{

    // Create a list of ATR

    var atrList = new List<AverageTrueRange>();

    foreach (var security in changes.AddedSecurities)

    {

        // Creat an ATR and update it with Historical data

        var atr = new AverageTrueRange(security.Symbol, 14);

        foreach (var bar in History(security.Symbol, 20, Resolution.Daily))

        {

            atr.Update(bar);

        }

		atrList.Add(atr);

    }

    

    // On the two symbols with the lowerest ATR are allowed to be traded

    _allowedSymbols = atrList.OrderBy(x => x).Select(x => x.Name).Take(2).ToList();

}

Finally in OnData, we will use _allowedSymbols filter which symbols to trade.

Reverb

69 ,

Thanks Alexandre. I gave up trying to do any kind of advanced filtering with universe selection, and now I'm focusing on keeping track of indicators in a custom wrapper class and doing filtering in OnData, like you suggested. I ended up using a similar approach, guided mostly by your responses to another question about universe + history. I've found your code snippets to be very helpful!

Reverb

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