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feat: add 5 new plot specifications
- line-filled: Filled Line Plot - bar-categorical: Categorical Count Bar Chart - histogram-stepwise: Step Histogram - violin-box: Violin Plot with Embedded Box Plot - area-stacked-percent: 100% Stacked Area Chart 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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‎plots/area-stacked-percent/specification.md‎

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# area-stacked-percent: 100% Stacked Area Chart
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## Description
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A stacked area chart normalized to 100%, where each area represents the percentage contribution of a category to the total. The combined height always equals 100%, showing proportional changes over time.
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## Applications
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- Market share evolution over time
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- Portfolio composition changes
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- Budget allocation trends
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- Demographic proportion shifts
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## Data
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The visualization requires:
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- **X variable**: Continuous variable (typically time)
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- **Multiple Y variables**: Categories to stack (values normalized to percentages)
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Example structure:
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```
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Time | Category A | Category B | Category C
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-----|------------|------------|------------
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2020 | 40 | 35 | 25
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2021 | 45 | 30 | 25
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2022 | 50 | 28 | 22
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...
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```
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## Notes
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- Total always equals 100%
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- Shows relative proportions, not absolute values
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- Good for composition changes over time
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- Each area width shows percentage contribution

‎plots/area-stacked-percent/specification.yaml‎

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spec_id: area-stacked-percent
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title: 100% Stacked Area Chart
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created: '2025-12-30T11:00:00Z'
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updated: '2025-12-30T11:00:00Z'
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issue: 2647
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suggested: claude-code
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tags:
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plot_type: [area, stacked, percentage]
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domain: [business, finance]
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features: [normalized, composition, time-series]
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data_type: [numeric, continuous]

‎plots/bar-categorical/specification.md‎

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# bar-categorical: Categorical Count Bar Chart
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## Description
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A bar chart that automatically counts the frequency of each category in a dataset. Unlike basic bar charts that plot pre-computed values, this chart takes raw categorical data and computes the counts.
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## Applications
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- Frequency distribution of categorical variables
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- Survey response tallying
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- Event occurrence counts by type
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- Category popularity analysis
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## Data
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The visualization requires:
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- **Categorical variable**: Raw category values (counts computed automatically)
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Example structure:
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```
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Category
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--------
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A
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B
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A
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C
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A
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B
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...
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```
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## Notes
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- Y-axis shows count/frequency
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- Categories displayed on x-axis
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- Can optionally sort by count (descending)
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- Similar to histogram but for categorical data

‎plots/bar-categorical/specification.yaml‎

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spec_id: bar-categorical
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title: Categorical Count Bar Chart
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created: '2025-12-30T11:00:00Z'
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updated: '2025-12-30T11:00:00Z'
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issue: 2644
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suggested: claude-code
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tags:
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plot_type: [bar, count]
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domain: [statistics, general]
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features: [frequency, categorical]
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data_type: [categorical]

‎plots/histogram-stepwise/specification.md‎

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# histogram-stepwise: Step Histogram
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## Description
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A histogram displayed as step lines (outline only) without filled bars. The distribution is shown as connected horizontal and vertical line segments, creating a step function appearance.
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## Applications
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- Comparing multiple distributions without visual overlap
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- Clean, minimal histogram visualization
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- Overlaying distributions for direct comparison
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- Print-friendly histogram representation
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## Data
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The visualization requires:
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- **Continuous variable**: Values to bin and count
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Example structure:
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```
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Value
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------
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12.5
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18.3
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15.7
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22.1
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...
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```
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## Notes
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- No fill, only outline (step lines)
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- Each bin represented by horizontal segment at count level
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- Vertical segments connect adjacent bins
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- Ideal for overlaying multiple distributions

‎plots/histogram-stepwise/specification.yaml‎

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spec_id: histogram-stepwise
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title: Step Histogram
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created: '2025-12-30T11:00:00Z'
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updated: '2025-12-30T11:00:00Z'
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issue: 2645
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suggested: claude-code
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tags:
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plot_type: [histogram, distribution]
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domain: [statistics]
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features: [step, outline, unfilled]
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data_type: [numeric, continuous]

‎plots/line-filled/specification.md‎

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# line-filled: Filled Line Plot
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## Description
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A line plot with the area between the line and the baseline (typically x-axis) filled with a semi-transparent color. This creates an area chart effect for a single series, emphasizing the magnitude of values.
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## Applications
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- Emphasizing magnitude of values over time
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- Volume or quantity visualization
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- Single series with area emphasis
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- Stock price or metric trends
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## Data
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The visualization requires:
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- **X variable**: Continuous variable (often time)
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- **Y variable**: Single numeric variable
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Example structure:
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```
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X | Value
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-----|-------
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0 | 10
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1 | 15
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2 | 12
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3 | 18
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...
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```
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## Notes
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- Fill should be semi-transparent (alpha ~0.3-0.5)
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- Line should be visible on top of the fill
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- Fill color typically matches line color
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- Baseline is usually y=0

‎plots/line-filled/specification.yaml‎

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spec_id: line-filled
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title: Filled Line Plot
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created: '2025-12-30T11:00:00Z'
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updated: '2025-12-30T11:00:00Z'
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issue: 2643
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suggested: claude-code
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tags:
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plot_type: [line, area]
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domain: [general, finance]
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features: [filled, single-series]
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data_type: [numeric, continuous]

‎plots/violin-box/specification.md‎

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# violin-box: Violin Plot with Embedded Box Plot
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## Description
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A violin plot with an embedded box plot inside, combining the distribution shape visualization (KDE) with traditional quartile statistics. Shows both the probability density and summary statistics in one plot.
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## Applications
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- Complete distribution visualization
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- Combining density estimate with summary statistics
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- Detailed group comparisons
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- Statistical presentations requiring both views
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## Data
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The visualization requires:
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- **Numeric variable**: Values to show distribution
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- **Categorical variable**: Groups to compare
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Example structure:
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```
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Value | Group
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------|-------
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45.2 | A
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52.1 | A
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38.7 | B
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41.3 | B
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...
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```
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## Notes
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- Box plot centered inside violin
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- Shows median, quartiles (box), and whiskers
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- KDE (violin) shape visible around the box
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- Outliers can be shown as points

‎plots/violin-box/specification.yaml‎

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spec_id: violin-box
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title: Violin Plot with Embedded Box Plot
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created: '2025-12-30T11:00:00Z'
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updated: '2025-12-30T11:00:00Z'
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issue: 2646
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suggested: claude-code
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tags:
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plot_type: [violin, box, distribution]
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domain: [statistics]
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features: [combined, kde, quartiles]
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data_type: [numeric, categorical]

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