Radar Perene / Archive / science

One index, many regimes: why Structural Ânima and Tactical Ânima are not the same index

◦ Index methodology v2.2 (working papers with DOI). See the methodology.

Science

A city's climate and today's weather share the same object — the atmosphere — and nobody confuses the two. A sunny afternoon in the middle of winter does not repeal the season; a harsh winter does not prevent the sunny afternoon. Instruments that measure the same object on different time scales measure, in practice, different things — and one's ruler applied to the other's question produces absurd answers with the appearance of precision. Market sentiment has exactly that structure, and that is why this house's Ânima family consists of two indices, not one.

Structural Ânima and Tactical Ânima share the object — the mood of the Brazilian market — and part ways on the time scale: the structural one reads the slow layer, which forms and dissolves over months; the tactical one reads the fast layer, which moves in days and weeks. Each has its own public working paper, with a permanent DOI and independent versioning: The Structural Ânima Index, at version 2.3, and The Tactical Ânima Index, at version 2.0. Two documents, two contracts, two lines of accountability — because they are two instruments.

Why a single index with two readings would not do

The legitimate question is why separate them, rather than publish one index with a "smoothed" variant. The answer lies in what smoothing destroys. A moving average of the fast layer is not the slow layer — it is the fast layer with a delay. The substrate of sentiment, the one the Structural Ânima article described as the soil on which headlines land, is not the flattened surface: it forms by accumulation of collective experience and obeys a dynamic of its own. Treating one as a derivative of the other would be a strong methodological claim — and a false one in practice, because the two layers diverge frequently, and the divergence is precisely the information.

The most instructive episodes in the house's archive are the ones of disagreement: a panicking surface over a background that did not move, or a serene surface over a slowly deteriorating background. A single index, forced to summarize both layers in one number, would erase exactly those episodes — and with them the ability to record that a market can be, at the same time, calm and fragile, or agitated and firm.

Two instruments, two lines of accountability

The separation also has a governance consequence a single index would not offer: each instrument answers for its own contract. The two papers declare their own concepts, sources and limits; one's revisions do not contaminate the other; and each track record can be audited on its own. Tactical Ânima, in fact, has already paid the price of that independence in the open — the current version of its paper records the refutation of a thesis earlier versions explored, a case of the same revision protocol this trail documented for the ILI. The structural one, with a slower object, has its own version trail. Two DOIs side by side mean exactly that: neither hides behind the other.

What the two papers do not hand over — and declare they do not — is the mechanics: exact components, weights, and any internal rule for reading them together. How the two articulate in the house's daily production is craft; that the two exist as independent measures, with independent public contracts, is the verifiable commitment.

The bridge to the regime literature

For the reader coming from statistics, the Ânima pair is the applied version of an idea the literature formalized by another route: that economic series do not live in a single state — they alternate between regimes with dynamics of their own, as Track 1 presents in what regime switching is. The slow layer of sentiment is, in that language, a reading of the prevailing regime; the fast layer, of the state within the regime. The sunny afternoon in winter, again: the daily datum does not repeal the season, and models that ignore the season read every sunny afternoon as spring.

The reading implication is direct and applies to any user of the two indices: questions on different horizons call for different instruments. Interrogating the tactical index about the background condition is reading the climate off today's thermometer; interrogating the structural one about next week is consulting the season to decide on the umbrella.

Frequently asked questions

Can the two indices disagree?

They can and they should — disagreement is information, not defect. Surface and background at odds describe a real market condition no single number would capture. The house's archive records those episodes as the family's most instructive.

Which of the two is "the" Ânima of the Diário?

The Diário reads the mood through both layers, each in its role — the state of the day against the backdrop. When the readings diverge, the divergence is stated, not arbitrated: recording the disagreement is more honest than settling it wholesale.

Why do the two papers carry different versions (2.3 and 2.0)?

Because the documents evolve independently, each at the pace of the revisions its object demanded. The mismatched numbering is separate governance working in plain sight — synchronized versioning is what would signal a single contract disguised as two.

Is there a public rule for combining the two?

No — the articulation between the layers in the house's production is part of the reserved mechanics, like each index's weights. What is public are the two conceptual contracts and the readings each produces.

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Continue the trail: Market relationships that do not survive: what remained after testing everything again →

House reading: both layers of the mood are in today's Diário; the episodes where they disagreed, in the Atlas.

Understanding which of the two scales serves a specific analysis horizon is a conversation the house has case by case.