Relative Price Ratio

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Relative Price Ratio

posted

Hi all,

I am trying to create a relative price ratio between two assets (e.g. between TLT and SPY) but kept getting an error. Wondering if anybody can give any suggestion on how to resolve this?

3 responses

check how the two dataframes are indexed/columned

Use either method 1 or method 2.

In method 1, you have created two Series that can be divided directly.

In method 2 you have created two DataFrames with equity object column labels e.g. Equity(8554 [SPY])
To divide these two DataFrames you have to reference the column labels for each.
The symbols() function converts the symbol strings to equity objects.

import numpy as np  
startDate = '2019-10-4'  
endDate = '2019-12-31'

# Method 1

pxTLT = np.log(get_pricing('TLT', start_date= startDate, end_date= endDate, fields= 'price', frequency='daily'))  
pxSPY = np.log(get_pricing('SPY', start_date= startDate, end_date= endDate, fields= 'price', frequency='daily'))  
px = pxTLT / pxSPY

print(px.tail())


# Method 2

pxTLT = np.log(get_pricing(['TLT'], start_date= startDate, end_date= endDate, fields= 'price', frequency='daily'))  
pxSPY = np.log(get_pricing(['SPY'], start_date= startDate, end_date= endDate, fields= 'price', frequency='daily'))  
px = pxTLT[symbols('TLT')] / pxSPY[symbols('SPY')]

print(px.tail())

Thanks Steve, method 2 works like a charm.

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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 Quantopian.

In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian 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.