Confidence intervals, charted

<script>
  import { createGrid, createStat } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.esm.min.js';
  import createLatticeAction from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/svelte.esm.min.js';
  import { createChart } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/charts.esm.min.js';

  const lattice = createLatticeAction({ createGrid });

  let chartEl;
  let tileEl;

  const config = {
    rowKey: 'id',
    toolPanel: { side: 'left', panels: ['filters', 'columns', 'statistics'] },
    columns: [
      { field: 'supplier', title: 'Supplier', filter: { type: 'set' } },
      { field: 'days', title: 'Lead time', type: 'number', format: { suffix: ' d', maximumFractionDigits: 1 }, total: 'avg' },
    ],
    rows,  // e.g. [{ id: 'O0', supplier: 'Kestrel', days: 3.1 }, ...]
    // onGrid hands over the live grid the moment it is created.
    onGrid: (grid) => {
      // interval() is the range the mean is pinned to, computed over the filtered
      // rows. The tile shows it under the value; ask for a proportion with
      // { kind: 'proportion' } and a rule for what counts as a success.
      createStat({ grid, container: tileEl, title: 'Mean lead time', of: 'days', fn: 'avg',
        interval: (value, grid) => grid.statistics.interval('days'), footer: '95% confidence interval' });

      // error: true draws each mean's 95% interval as a whisker, computed from the
      // readings behind the bar. The chart reads the same grid as the tile, so the
      // bars and the whiskers follow the filters.
      createChart({ grid, container: chartEl, type: 'bar', x: 'supplier', y: { col: 'days', fn: 'avg' },
        error: true, title: 'Mean lead time by supplier, with 95% confidence interval' });
    },
  };
</script>

<svelte:head>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.min.css">
</svelte:head>

<div bind:this={chartEl} style="height: 250px"></div>
<div bind:this={tileEl} style="margin: 14px 0"></div>
<div use:lattice={config} style="height: 340px"></div>