STATFOR Forecast

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README.md

Inspired by the Vega implementation of NYT Amanda Cox's Budget Forecast.

forecasts.csv

forecasts.json

[
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    "forecastYear": 1990,
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  {
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]

index.html

<html>
  <head>
    <title>STATFOR Forecasts</title>
    <script src="https://vega.github.io/vega-editor/vendor/d3.min.js"></script>
    <script src="https://vega.github.io/vega-editor/vendor/vega.min.js"></script>
  </head>
  <body>
    <div id="vis"></div>
  </body>
<script type="text/javascript">
// parse a spec and create a visualization view
function parse(spec) {
  vg.parse.spec(spec, function(chart) { chart({el:"#vis"}).update(); });
}
parse("spec.json");
</script>
</html>

spec.json

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    },
    {
      "name": "handleYear",
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        {
          "type": "mousemove[dragging]",
          "expr": "clamp(eventX(), 10, 10000)",
          "scale": {"name": "x","invert": true}
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      ]
    },
    {
      "name": "currentYear",
      "init": 2010,
      "expr": "clamp(handleYear, 1990, 2015)"
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      "name": "tipValue",
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      "name": "cursor",
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    {
      "name": "actuals",
      "source": "all",
      "transform": [{"type": "filter","test": "datum.type === 'actual'"}]
    },
    {
      "name": "tooltip",
      "source": "forecasts",
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        {
          "type": "filter",
          "test": "datum.budgetYear <= currentYear && datum.forecastYear == tipYear && abs(datum.forecast - tipValue) < 100000"
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          "type": "aggregate",
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            {
              "field": "value",
              "ops": ["min","argmin"],
              "as": ["min","argmin"]
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        {
          "type": "formula",
          "field": "minYear",
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    {
      "name": "tipForecast",
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      "name": "y",
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      "title": "Movements",
      "tickSize": 1,
      "properties": {
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          "strokeOpacity": {"value": 0.75}
        },
        "axis": {"stroke": {"value": "#edf1f7"}},
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          "x": {"scale": "x","field": "argmin.forecastYear"},
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          "x": {"scale": "x","signal": "currentYear"},
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          "cursor": {"value": "pointer"}
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      "type": "group",
      "from": {"data": "tooltip"},
      "properties": {
        "update": {
          "x": {
            "scale": "x",
            "field": "argmin.forecastYear",
            "offset": -5
          },
          "y": {
            "scale": "y",
            "field": "argmin.forecast",
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          "height": {"value": 35},
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        {
          "type": "text",
          "properties": {
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              "text": {
                "template": "Forecast from early {{parent.argmin.budgetYear}}"
              },
              "fill": {"value": "black"},
              "fontWeight": {"value": "bold"}
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        {
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              "fill": {"value": "black"},
              "align": {"value": "left"}
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}

thumbnail.png