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James Marsden Hurst 1924—2005 Biography and works
Chapter 4.4 — Timing Your Buys With Graphics

Edge-band and mid-band: two entries in Hurst's method

Hurst distinguishes an entry near the channel's lower boundary from a later one near its center; the Gruen comparison illustrates the trade-off, not general superiority.

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In one sentence — Edge-band enters early near the lower boundary; mid-band waits for another pause near the center. The first seeks more room, the second more confirmation.

Position comes after the signal

Both labels belong to the Chapter 4 graphic method. They first require an estimated low window, a favorable sum of higher components, and a break of a valid downtrend line. Only then does Hurst distinguish where price sits inside the envelope.

“Band” means an area, not an exact level. The channel itself is estimated: amplitude, center line, and boundary may change as new extremes arrive.

Two entry points, two trade-offs Interactive figure with lower edge, channel center, VTL confirmation, and the limit of the historical comparison. Earlier or after confirmation? Hurst’s historical labels: edge-band and mid-band EDGE-BAND MID-BAND The Gruen comparison is one case, not a universal ranking i Cyclepedia diagram · Emiciclo
Two points within the same structure, with different trade-offs. Tap the entries, center, and comparison limit.
Select the highlighted points to explore the detail

Edge-band: early confirmation at the boundary

An edge-band entry occurs when the VTL breaks in the turn zone near the lower boundary. In the historical model, substantial room remains before the upper edge, so potential movement relative to elapsed time may look attractive.

The cost of early timing is more fragile confirmation. An incorrect envelope, a poorly selected VTL, or wrongly directed longer components can turn the presumed boundary into a passage toward lower prices. An invalidation point is therefore not optional.

Mid-band: a second opportunity

After the first rise, a shorter component can produce a pause or contraction. Hurst draws another VTL on the pause’s upper edge. If it breaks near the operating channel’s midpoint, he calls it a mid-band entry.

Price has already crossed part of the channel, so less room remains. Hurst argues that the dominant components may change faster near the central area and expresses the comparison as return per unit of time. This is a logic internal to the model, not a universal property of every channel center.

What the Gruen case shows

In the book’s account, the edge-band entry is around 7½, and the security reaches about 13 over 65 days. The later mid-band entry is around 8½ and is compared with a close about 36 days later. Hurst annualizes both moves and obtains very high percentages, with the mid-band figure higher.

Those annualizations magnify a single short move as if it could repeat for a year. They are historical case figures, not expected-return estimates. The comparison does not control for security selection, losing periods, liquidity, slippage, or multiple attempts.

How to compare them properly

A modern test would use identical rules for defining envelopes, VTLs, and entries; include every signal, costs, and missed trades; and separate development from evaluation samples. Bailey, Borwein, López de Prado, and Zhu show how repeated backtest optimization can select strategies that deteriorate out of sample. Their study does not test edge-band or mid-band, but it describes the relevant methodological risk.

Evidence boundary — Gruen illustrates two successful entries during one rise. It does not establish which is generally better or the false-signal rate. The book’s annualized percentages are not repeatable-return estimates.

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