Hi everyone, I'm trying to calculate volatility by dividing ATR by the stock's price, but I keep getting the error that I can't divide AverageTrueRange Object by float. The relevant code and the whole program is attached below. Thanks to anyone who can help!


        for ticker in symbols:
            self.AddEquity(ticker, Resolution.Minute)
            self.tickers[ticker] = self.ATR(ticker, 14, MovingAverageType.Simple, Resolution.Minute)/self.Securities[ticker].Price

 

class EmotionalFluorescentPinkSalmon(QCAlgorithm):

    def Initialize(self):
        self.SetStartDate(2018, 1, 1)
        self.SetEndDate(2021, 11, 1)
        self.SetCash(100000)
        
        self.tickers = {}
        
        symbols = ["AMZN", "MSFT", "AAPL"]
        
        for ticker in symbols:
            self.AddEquity(ticker, Resolution.Minute)
            self.tickers[ticker] = self.ATR(ticker, 14, MovingAverageType.Simple, Resolution.Minute)/self.Securities[ticker].Price 
            
        self.tickers = {k: v for k, v in sorted(self.tickers.items(), key=lambda item: item[1], reverse=True)[:1]}
        
        
        self.portfolio_targets = []
        
        for stock, volt in self.tickers.items():
            self.stock = self.AddEquity(stock, Resolution.Minute).Symbol
            self.portfolio_targets.append(self.stock)
                
        self.spy = self.AddEquity("SPY", Resolution.Minute).Symbol
        self.SetWarmUp(1, Resolution.Daily)
        self.yest_close = self.SMA(self.spy, 1, Resolution.Daily, Field.Close)
        
        """
        Figure out universe selection error
        """
            
    def OnData(self, data):
        
        if self.IsWarmingUp or not self.yest_close.IsReady or not len(data.Bars) > 0: 
            return 
        
        # If SPY is above yesterday's close at 9:45, go long all stocks in ticker_symbols
        if self.Time.hour == 9 and self.Time.minute == 45:
            for stock in self.portfolio_targets:
                price = self.Securities[self.spy].Price
                yest_close = self.yest_close.Current.Value
            
                if price < yest_close:
                    self.SetHoldings(stock, 1/len(self.portfolio_targets))
        
        if self.Time.hour == 15 and self.Time.minute == 45:
            self.Liquidate()

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