如何在Vega-Lite中创建分组或成对的箱形图？

Question

就像这个： https://www.r-graph-gallery.com/265-grouped-boxplot-with-ggplot2/

我尝试过刻面，色彩通道和构图，  但效果不佳。

我的用例很容易比较分组平均值，因此我需要并排组合箱形图

Answer 1

您可以结合使用列编码和x编码。这是一个有关vega数据集填充数据（vega editor link）的示例：

{
  "data": {"url": "data/population.json"},
  "mark": {
    "type": "boxplot",
    "extent": "min-max"
  },
  "encoding": {
    "column": {"field": "age","type": "ordinal"},
    "y": {
      "field": "people",
      "type": "quantitative",
      "axis": {"title": "population"}
    },
    "x": {
      "field": "sex",
      "type": "nominal"
    },
    "color": {
      "field": "sex",
      "type": "nominal"
    }
  }
}