Who this entry is for — Readers who want to distinguish a correction from the end of a trend and understand why the same session may have different meanings on different horizons.
The Dow tradition treats the market as the superposition of three simultaneous movements:
- the major or primary movement;
- the secondary movement, contrary to or contained within the primary;
- the daily fluctuation.
The classification anticipates modern multi-timeframe analysis, but does not coincide with a set of fixed windows.
Definitions in the sources
In plain language — The large movement establishes the context; the intermediate movement interrupts or corrects it; the daily movement contains much of the local noise.
| Movement | Nelson, 1903 | Hamilton, 1922 | Historical function |
|---|---|---|---|
| Primary | major swing of about 4–6 years | at least one year, often longer | dominant direction of the market |
| Secondary | about 10–60 days; often 30–40 | rally in a bear market or reaction in a bull market | significant interruption of the primary |
| Daily | change from one day to the next | continuous underlying fluctuation | local information, less useful to the general barometer |
The differences between the two works are substantial. They show that the durations were observations from the historical sample, not natural constants to be transferred automatically to every market.
Movements within movements
In the “Swings Within Swings” chapter of the editorials collected by Nelson, the central point is the coexistence of scales. A commentary may be bullish on the immediate movement and bearish on the larger movement without being contradictory.
| Primary context | Secondary movement | Reading in the tradition |
|---|---|---|
| bullish | decline | reaction within the bull market, until the primary structure changes |
| bearish | advance | rally within the bear market, not independent evidence of a new bull market |
| uncertain | narrow range |
This hierarchy prevents every contrary movement from being called a “reversal”. The proper question is not only is price rising or falling?, but which scale is moving, and which structure is it interrupting?
How Hamilton recognises the primary movement
Hamilton observes sequences in the averages. In his account:
- a bull market shows successive highs and lows advancing;
- a bear market shows new lows and recoveries that fail to re-establish the previous structure;
- a primary turn requires a sequence of zig-zag movements, not a single session;
- the two averages must corroborate the direction.
The modern notation HH/HL/LH/LL is useful for describing this structure, but
does not appear as a formal code in the original works.
When a secondary becomes a primary
Hamilton proposes a progressive reading: after a secondary rally in a bear market, a reaction that does not return to the old lows, followed by a break above the rally high, may indicate the birth of a bull market. The sequence must be read on the averages and confirmed, not anticipated from the first bounce.
This does not provide a forecast of duration. Hamilton explicitly states that the barometer may recognise the change without knowing how long it will continue.
Difference from a modern timeframe
A timeframe is the aggregation of data—for example five minutes, one hour or one day. Dow's movements instead describe an economic and behavioural hierarchy observed through market averages.
An intraday chart may contain trends at several scales, but calling them “primary”, “secondary” and “daily” in the Dow sense is already a modern adaptation. To remain faithful to the sources, the analyst should state:
- the instrument or index observed;
- the data frequency;
- the rule used to identify highs and lows;
- the threshold or criterion separating a secondary movement from noise;
- the confirmation method.
Common error — Turning “4–6 years” or “10–60 days” into mandatory parameters. They are historical descriptions that already differ between 1903 and 1922.
Sources
- S. A. Nelson, The A B C of Stock Speculation, 1903, ch. VII “Three General Lines of Reasoning” and ch. VIII “Swings Within Swings”, pp. 36–41, Internet Archive.
- William Peter Hamilton, The Stock Market Barometer, 1922, ch. I “Cycles and Stock Market Records” and ch. XIII “Nature and Uses of Secondary Swings”, Internet Archive.