Strip Plot With Median

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1

Hi everyone,
I have a strip plot and struggling to overlay the median of each faceted group on this plot using Deneb’s in-visual calculation.
Kindly find the attached PBIX file below, which includes the work in progress and the target visual image.
Strip Plot with Median.pbix (1.8 MB)

2

Hi @Daniel_Derek.

To layer a median line over a strip plot (or any other plot, for that matter), use a standard layer block with nested blocks for the strip plot and the median line.

To create the faceted groups, one way is to use a standard explicit facet-spec syntax instead of an implicit “column” block in the encoding block.

eDNA Forum - Deneb Strip Plot with Median - 1
eDNA Forum - Deneb Strip Plot with Median - 12233×1194 137 KB

Here’s the JSON specification code I used:

{
  "data": {"name": "dataset"},
  "spacing": 60,
  "facet": {
    "column": {"field": "Year"}
  },
  "spec": {
    "height": 500,
    "width": 300,
    "encoding": {
      "x": {
        "field": "Index",
        "type": "quantitative",
        "scale": {"domain": [0, 110]},
        "axis": {
          "ticks": false,
          "tickCount": 3,
          "title": null
        }
      },
      "y": {
        "field": "Continent",
        "type": "nominal",
        "axis": {
          "ticks": false,
          "grid": false
        }
      }
    },
    "layer": [
      {
        "name": "STRIP_PLOT",
        "mark": {
          "type": "tick",
          "color": "#BADAD8",
          "tooltip": true
        },
        "encoding": {
          "tooltip": [
            {"field": "Country"},
            {
              "field": "Index",
              "title": "CPI value"
            }
          ]
        }
      },
      {
        "name": "MEDIAN",
        "mark": {
          "type": "line",
          "color": "#FF0000",
          "point": {
            "type": "circle",
            "stroke": "#FF0000",
            "fill": "#FFFFFF",
            "size": 200
          }
        },
        "encoding": {
          "x": {
            "aggregate": "median",
            "field": "Index",
            "type": "quantitative"
          }
        }
      }
    ]
  }
}

Hope it helps.
Greg
eDNA Forum - Deneb Strip Plot with Median.pbix (1.8 MB)

2 Likes
3

That was very helpful, thank you so much @Greg

Kind regards
Daniel