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Source: backtest.substack.com​

SPY Short-Term Forecast and Trading Outlook for Tuesday, Oct 7, 2025

10/6/2025

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More of the same today. We closed lower than the open again. What we really need now is a bit of weakness in $SPY, something to reset conditions and create a better setup for swing longs.
To give a quick snapshot of the kind of trading regime we’re stuck in, let’s apply a few simple filters:
  • Price is above the 200-period moving average
  • The 7-period RSI is between 75 and 80 (that’s elevated)
  • The rate of change over the past 126 bars (roughly six months) is greater than +15%
This specific condition has shown up 76 times in SPY’s history. If you were to buy the open the day after this setup triggers and exit the next open (a one-day hold), here’s what the stats look like:
  • 42.1% winners
  • Average winner: +0.54%
  • Average loser: -0.65%
  • 10 trades lost more than 1%, and 5 gained more than 1%
When the gauges lean negative, think in terms of probabilities. Sure, the market can still have good days, but across all historical instances of this type of regime, the odds tend to tilt toward the weaker side. It’s not a crash signal; it just means the near-term projection isn’t as strong as usual.
If we keep the same parameters and stretch the test out to 3 days, we get 63 total triggers:
  • 54% winners
  • Average winner: +0.75%
  • Average loser: -1.18%
  • 9 trades lost more than 1.5%, and 4 gained more than 1.5%
You can check the gauges on the Trading Forecast Page each day — it’s a great way to add another layer of context to your trading toolbox.
Trade well,
Dave Johnson
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    Dave Johnson

    I'm Dave Johnson, a former investment advisor and quantitative system developer with over 30 years of experience building and trading mechanical systems. These days I focus on rules-based research, honest backtests, and sharing what the data actually shows.

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