[line-cycle-seasonal] Cycle Plot for Seasonal Subseries

[MarkusNeusinger]

New plot type request.

A cycle plot (seasonal subseries plot) as introduced by Cleveland: the time series is split by seasonal period (e.g. one panel or group per month/weekday), within each group the values are plotted in chronological order as a small line, and a horizontal reference line marks the group mean. This separates the seasonal pattern (differences between group means) from the trend within each season.

Why: a classic statistical graphic for seasonality analysis that complements the existing timeseries-decomposition and acf-pacf specs; fits the catalog's strong statistics family. Fully static-renderable.

[claude]

✅ Spec ID: line-cycle-seasonal

Valid and useful — the cycle plot (Cleveland's seasonal subseries plot) is a classic seasonality graphic that complements timeseries-decomposition and acf-pacf, and no equivalent exists in plots/. It is fully static-renderable: per-season subseries lines with horizontal group-mean reference lines. Modeled as a faceted line plot.

Rationale: line is the canonical plot type (per-season chronological mini-lines); cycle-seasonal captures the seasonal-subseries variant.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: ${SPEC_ID}

PR: #$PR_NUMBER

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specification.md

$SPEC_CONTENT

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[github-actions]

🚀 Specification Merged!

Specification: ${SPEC_ID}
PR: #$PR_NUMBER (merged)

The specification is now in main and synced to PostgreSQL.

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Available libraries: matplotlib, seaborn, plotly, bokeh, altair, plotnine, pygal, highcharts, letsplot

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