The five-channel marketing-attribution dataset behind Lina's clustered-column failure vs the single-encoding Big Idea rebuild in Chapter 3 of The Defensible Decision. Five channels, four metrics each, one audience question — and one chart shape that answers it in three seconds.
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README.txt
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SCHEMA.txt
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lina-channel-romi.csv
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lina-channel-romi.json
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Start with README.txt for purpose and limitations, then use SCHEMA.txt for field definitions.