Market & Economic Indices

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Abstractions about how price, output, and market activity are measured or interpreted through indices and stochastic patterns, including compiled statistical indices (producer price index, cost-weighted activity index), market-breadth and technical-analysis constructs (TRIN, Elliott Wave Principle), and stochastic-process characterizations of price paths (quasimartingale).

5 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Cost-Weighted Activity Index — A nonmarket output-volume index that aggregates changes in homogeneous service activities using base-period cost shares or unit costs as weights.
• Elliott Wave Principle — Interpret market-price charts through a recursively nested taxonomy of motive and corrective wave counts, while treating every count as a revisable reading rather than established predictive evidence.
• Producer Price Index — A periodically compiled price index estimating average change over time in transaction prices received by domestic producers for a defined, weighted set of outputs at specified stages of production.
• Quasimartingale — An adapted stochastic process of finite mean variation; with càdlàg paths it coincides with a semimartingale.
• TRIN (Arms Index) — An intraday market-breadth indicator equal to the ratio of advancing to declining issues divided by the ratio of advancing to declining share volume for the same universe and interval.