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James Marsden Hurst 1924—2005 Biography and works
Chapter 8.2 — Trading by Logic

Hurst's cyclic market state: the 1968 case

Hurst combined three Dow components and a half-span average to read the market on 1 November 1968; this entry separates historical calculation from proof.

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Immediate definition

In plain words — Cyclic market state is a timing map: Hurst observes several index oscillations, estimates their positions, and asks which are pushing in the same direction. It is a probabilistic reconstruction, not a certain calendar.

On 1 November 1968, Hurst applies this reading to the Dow Jones Industrial Average before selecting an individual stock. Three “clocks” have different durations and may point in opposing directions. His conclusion comes from their combination: the long and intermediate components still provide upward pressure, while the shorter one appears to have passed its top.

Three clocks, one conditional viewReconstruction of 1 November 1968 — not a current forecast Three clocks, one conditional view Reconstruction of 1 November 1968 — not a current forecast 4.5 years 24 / 52 residual lift i 18 months 32 / 71±4 top in 3–4 weeks i 26 weeks 12 / 21,4 already past top i 10-week half-span: historical target 1001 ± 14A known outcome does not replace out-of-sample testing i Cyclepedia diagram · Emiciclo
The three components did not give the same signal. Hurst inferred a short bullish window followed by downside risk.
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The three historical clocks

The roughly 4.5-year cycle stood at 24 months of a recent 52-month duration. Under the model, the top lies around the midpoint: some mild upward or sideways pressure remained, with the next low tentatively placed in the first quarter of 1971.

The 18-month cycle began at the 817.61 low in the week of 22 March 1968. Thirty-two weeks had passed against an estimate of 71 ± 4; its top was expected after another three or four weeks. The shorter nominal 26-week cycle began at 863.33 in the week of 9 August. Twelve weeks out of an observed 21.4 ± 3.5 suggested that its midpoint had already passed.

The book's synthesis is conditional: trade long for about another month, then prepare for the short side as signals develop. This is not a universal rule that “three cycles mean buy.” It depends on chosen durations, identified lows, and the convention that places the high around mid-cycle.

The half-span check

Hurst then uses a ten-week average as a half-span approximation for the 21.4-week component. The conjunction is placed at 932 in the week of 27 September. The rise from 863 to 932, or 69 points, is treated as half the total move: the projection becomes 1001 ± 14, a 987–1015 zone. With the Dow at 948.4 on 1 November, the book concludes that upside room remains.

This calculation accurately describes the historical procedure. It does not produce a probability, statistical confidence interval, or guarantee. The ±10% comes from Hurst's operating rule, not from an error distribution estimated on an independent sample.

Where hindsight can enter

In a reconstruction with a known outcome, it is easy to confirm the clearest lows and ignore plausible alternatives. Changing the selected durations also changes the phase assigned to each component. Testing the procedure would require timestamped analyses, frozen rules, all signals, and a period never used to define the model.

False alarms and days without a clear conclusion must also be recorded. One successful sequence teaches how the method works; it does not measure how often it works. The source-checked level concerns the historical accuracy of this entry, not the predictive accuracy of the technique.

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