Slovak parliamentary poll March 2018 vs Election results of 2016. In Vega-Lite spec. Load & plot via Vega Editor: https://vega.github.io/editor/#/gist/vega-lite/phivk/0692b23a7009dd430699d58bc63a322d/53f36d8041e281669fdd7fc082761335c12f44a0/sk_2016vs2018_polls.json Data src: http://preferencie.teraz.sk/Embed/f9413912c2b2454a9746f7f9b083cf0c

sk_2016vs2018_polls.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "title": "SK🇸🇰 Parliament 2016 Elections vs March 2018 Poll",
  "data": {
    "values": [
      {"party": "SMER-SD", "date": "03-2016", "votes": 737481, "percentage": 28.28, "seats": 49},
      {"party": "SMER-SD", "date": "03-2018", "percentage": 20.2},
      {"party": "SaS", "date": "03-2016", "votes": 315558, "percentage": 12.10, "seats": 21},
      {"party": "SaS", "date": "03-2018", "percentage": 14.0},
      {"party": "OĽaNO-Nova", "date": "03-2016", "votes": 287611, "percentage": 11.03, "seats": 19},
      {"party": "OĽaNO-Nova", "date": "03-2018", "percentage": 10.4},
      {"party": "Sme rodina", "date": "03-2016", "votes": 172860, "percentage": 6.63, "seats": 11},
      {"party": "Sme rodina", "date": "03-2018", "percentage": 10.4},
      {"party": "Kotleba - ĽSNS", "date": "03-2016", "votes": 209779, "percentage": 8.04, "seats": 14},
      {"party": "Kotleba - ĽSNS", "date": "03-2018", "percentage": 10.1},
      {"party": "SNS", "date": "03-2016", "votes": 225386, "percentage": 8.64, "seats": 15},
      {"party": "SNS", "date": "03-2018", "percentage": 10.0},
      {"party": "KDH", "date": "03-2016", "votes": 128908, "percentage": 4.94, "seats": 0},
      {"party": "KDH", "date": "03-2018", "percentage": 7.0},
      {"party": "Most-Híd", "date": "03-2016", "votes": 169593, "percentage": 6.50, "seats": 11},
      {"party": "Most-Híd", "date": "03-2018", "percentage": 5.6},
      {"party": "SMK-MKP", "date": "03-2016", "votes": 105495, "percentage": 4.05, "seats": 0},
      {"party": "SMK-MKP", "date": "03-2018", "percentage": 4.1},
      {"party": "KSS", "date": "03-2016", "votes": 16278, "percentage": 0.62, "seats": 0},
      {"party": "KSS", "date": "03-2018", "percentage": 1.5},
      {"party": "Progresívne Slovensko", "date": "03-2018", "percentage": 1.4},
      {"party": "Spolu-občianska demokracia", "date": "03-2018", "percentage": 1.1}
    ]
  },
  "transform": [
    {"calculate": "datum.date == '03-2016' ? '2016' : '2018' ", "as": "year"}
  ],
  "mark": "bar",
  "encoding": {
    "column": {
      "field": "party", 
      "type": "nominal",
      "sort": "ascending"
    },
    "y": {
      "field": "percentage", 
      "type": "quantitative",
      "axis": {"title": "% of (estimated) votes"}
    },
    "x": {
      "field": "year", 
      "type": "ordinal",
      "axis": {"title": ""}
    },
    "color": {
      "field": "party", 
      "type":"nominal",
      "scale": {
        "domain": ["SMER-SD", "SaS", "OĽaNO-Nova", "Sme rodina", "Kotleba - ĽSNS", "SNS", "KDH", "Most-Híd", "SMK-MKP", "KSS", "Progresívne Slovensko", "Spolu-občianska demokracia"],
        "range": ["#BA1514", "#A8E734", "#489648", "#6559C9", "#404040", "#3F128B", "#F2F19F", "#DE7F27", "#828282", "#F43530", "#00C1E2", "#0070C5"]
      }
    }
  }
}