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Question on how to write this part of my trading strategy....

Hi there,

I have been trying to learn to code, and have had a bit of trouble with these bits of coding:

  1. I want to set an initial stop loss for each position of 1.5 x 20 day ATR (Average True Range)
  2. I want the above value to be my stop loss, BUT I want this value to represent 0.30% of my total account equity at the time the position is opened.
  3. I want to go long a stock if it is within 10% of a rolling 52 week high price.

Any help would be greatly appreciated!

1 response

Welcome! I can help you with that.

To set a stop loss order, see here. You call:

order(security, amount, style=StopOrder(price))  

Now, you want to set the price to 1.5*ATR. You can get the ATR by doing

import talib

# Load historical data for the stocks  
high =  history(21, '1d', 'high')  
low =   history(21, '1d', 'low')  
close = history(21, '1d', 'close_price')  
# Calculate the ATR for the stock  
atr = talib.ATR(high[context.stock], low[context.stock], close[context.stock], timeperiod=20)[-1]  

For your second question, you can use order target percent, and simply target the value to .003. So your order would look like this:

order_target_percent(security, .003, style=StopOrder(1.5*atr))  

Finally, to get the 52-week high, you can use the history function again:

high_hist =  history(252, '1d', 'high') # 252 trading days per year  
yearly_high = max(high.values)[0]  

Let me know how that goes!

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