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TLT-SPY Return Delta as Stock Market Crash Indicator

December 30, 2021 • Posted in Equity Premium, Technical Trading

A subscriber hypothesized that a very large delta between daily iShares 20+ Year Treasury Bond (TLT) and SPDR S&P 500 (SPY) returns presages a stock market collapse, and asked for verification. To investigate, we consider two tests:

  1. Calculate correlations between daily TLT-SPY return delta and daily SPY returns over the next month (21 trading days). A stock market collapse during this interval should exhibit very negative correlations.
  2. Compute average next-day SPY returns by ranked tenth (decile) of daily TLT-SPY return deltas. Average SPY returns should be relatively very low for high deciles.

Using daily dividend-adjusted prices for TLT and SPY during late July 2002 (limited by TLT) through mid-December 2021, we find that: (more…)

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