Scraping Bond Yields to Build Forex Interest Rate Differentials
Summary
This article explains how to collect government bond yields from web pages and use them to derive interest rate differentials for forex analysis. It describes finding the data source in a page or its linked resources, extracting the quoted yield, and converting it to a numeric value. A sample Windows-based approach reads only an initial portion of a page when the relevant value appears near the beginning, reducing the amount of downloaded data.
The article connects yield differentials and changes in those differentials with exchange rate movement, illustrating the idea with EUR/USD. It outlines calculating a differential between two countries’ yields and smoothing its change with an exponential moving average; the discussion recommends infrequent updates because yields change more slowly than currency prices. This is a data collection and indicator construction method, not evidence of a reliable trading edge. The example depends on a website’s page structure remaining stable, and the author notes that scraped data should not necessarily be redistributed.
Key ideas
- Government bond yields can serve as market-based clues about expected interest rates.
- Forex analysis can compare yields across two currencies and track changes in their differential.
- A scraper can locate a yield in downloaded page content and convert it into a numeric value.
- An exponential moving average can smooth changes in the interest rate differential.
- Scraping depends on stable website structure and should use restrained update frequency.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.