S&P 500 ETF fair value, floor and ceiling

SPY Polynomial Fair Value & Phase Detector

CURRENT PHASE
Bear Market / Accumulation
PHASE COMPLETION
40.7%
FAIR VALUE
$776.35

Fair value is the fitted polynomial baseline in log-price space. The colored bands are +/-1σ, +/-2σ, and +/-3σ residual envelopes, creating a valuation map from accumulation through euphoria.

Reading the valuation chart

At the weekly candle labelled , the plotted close is $751.51, -3.2% relative to the fitted baseline. The reference lines below use that same candle, rather than the chart’s future extension.

Reference lineValue at this candle
−1σ reference$732.38
Fitted baseline$776.35
+1σ reference$822.96

The baseline is a polynomial fit in log-price space. The bands describe historical deviations from that fit; they are not guaranteed floors, ceilings or future confidence intervals. A fitted baseline is not an estimate of the business’s intrinsic value, and it can change when the model is refitted.

Weekly candle labels mark period end; the current candle may be incomplete. Read how valuation bands work and the research methodology.