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SPEM=JS(P^ ∥ R)\mathrm{SPEM} = \mathrm{JS}(\hat P \,\|\, R)

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Before any of that, credit belongs where the paper actually earned it, and the measurement is the place it earned it most cleanly. For each classification query, the paper’s own protocol produces two prompts with identical content and different label orders, records which label the model selects under each, and repeats this across three thousand randomly sampled queries per dataset — “designed to eliminate any potential bias in dataset sampling,” in the paper’s own description [ 1 ] . A primacy effect is declared when the first third of a label list accounts for more than forty percent of the model’s selections, aggregated across those three thousand trials; recency and middle effects use…

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SPEM=JS(P^ ∥ R)\mathrm{SPEM} = \mathrm{JS}(\hat P \,\|\, R)

Equation 1 · Language Models & Evaluation

Cognitive Bias Was the Label; Attention Sink Is the Suspect

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

Before any of that, credit belongs where the paper actually earned it, and the measurement is the place it earned it most cleanly. For each classification query, the paper’s own protocol produces two prompts with identical content and different label orders, records which label the model selects under each, and repeats this across three thousand randomly sampled queries per dataset — “designed to eliminate any potential bias in dataset sampling,” in the paper’s own description [ 1 ] . A primacy effect is declared when the first third of a label list accounts for more than forty percent of the model’s selections, aggregated across those three thousand trials; recency and middle effects use…

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