chart_bitter3.json

{ "$schema": "https://vega.github.io/schema/vega-lite/v5.json",

  "title": {
    "text": "A pint of bitter in London, 1988-2024",
    "subtitle":["ONS microdata",""],
    "subtitleFontStyle":"italic",
    "subtitleFontSize":10,
    "anchor": "start",
    "color": "black"
  },

  "data": {
    "url": "https://raw.githubusercontent.com/RDeconomist/RDeconomist.github.io/main/data/ukPrices_BitterLondon.csv",
    "format":{"type":"csv"}},

  "mark": {
    "type":"bar",
    "color":"rgba(0,67,167,1)"
  },
   
  "height": 300,
  "width": 500,

  "params": [    
    {"name":"selectedDate", "value":2005,
       "bind":{
         "input": "range",
         "min": 1988, 
         "max": 2024, 
         "step": 1,
         "name": "Select year:"}
    }],

   "transform": [
      {"filter": "datum.year==selectedDate"}
    ],

  
  "encoding": {
    "x": {
      "bin": true,
      "field": "price",
      "title": "price Bins"
    },
    
    "y": {
      "aggregate": "count",
      "title": "Number of pints"}
  }
}