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demo D230

An SPC study: control, range, capability in Vue

A drifting process with limits fixed on the first thirty readings, so the drift breaks a rule rather than being absorbed

chart type: control · movingRange · capability

This grid runs an SPC study, control, moving range and capability, with limits fixed on the first thirty readings so a later drift breaks a rule rather than being absorbed. It shows a process going out of control being caught, not smoothed over.

Building…
Loading a live grid…

This is the Vue 3 version. A createLatticeGrid component takes the configuration through v-bind, and reactive data flows straight into the grid, so it updates the way the rest of your Vue app does.

The configuration

<link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.min.css">
<style>
  #tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
  #control { height: 220px; margin-top: 14px; }
  #pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
  #pair > div { height: 200px; }
  #grid { margin-top: 12px; }
  #grid > div { height: 320px; }
</style>
<div id="app"></div>

<script type="module">
  import * as Vue from 'https://esm.sh/vue@3/dist/vue.esm-browser.prod.js';
  import { createGrid, createStat } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.esm.min.js';
  import createLatticeGrid from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/vue.esm.min.js';
  import { createChart } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/charts.esm.min.js';

  const LatticeGrid = createLatticeGrid({ vue: Vue, createGrid });

  Vue.createApp({
    components: { LatticeGrid },
    data() {
      return {
        config: {
          rowKey: 'id',
          toolPanel: { side: 'left', panels: ['columns', 'statistics'] },
          columns: [
            { field: 'n', title: '#', type: 'number', layout: { width: 80 } },
            // The tolerance is declared once, on the column; every SPC figure reads it.
            { field: 'bore', title: 'Bore', type: 'millimetres', spec: { lower: 9.95, upper: 10.05, target: 10 } },
          ],
          rows,  // measured parts, in the order they were made
        },
      };
    },
    mounted() {
      // The component exposes the live grid via a template ref. All three charts and
      // the capability tiles read that one instance.
      const grid = this.$refs.grid.grid();

      // Three figures read from the live grid: Cpk against the tolerance, the
      // mean bore, and the count. baseline fixes the control limits on the
      // first thirty readings, so the later drift breaks a rule.
      const tiles = document.getElementById('tiles');
      createStat({ grid, container: tiles.appendChild(document.createElement('div')), title: 'Cpk',
        value: (g) => g.statistics.capability('bore', { rules: 'nelson', baseline: 30 })?.cpk,
        goodWhen: 'up', baseline: 1.33, decimals: 2, footer: '1.33 is the usual floor' });
      createStat({ grid, container: tiles.appendChild(document.createElement('div')), title: 'Mean bore', of: 'bore', fn: 'avg' });
      createStat({ grid, container: tiles.appendChild(document.createElement('div')), title: 'Readings', fn: 'count', footer: 'the first 30 set the limits' });

      // baseline fixes the limits on the first 30 readings, so a later drift breaks a
      // rule rather than widening the limits to absorb it.
      createChart({ grid, container: '#control', type: 'control',     y: 'bore', baseline: 30, rules: 'nelson', title: 'Control chart, limits fixed on the first 30 readings' });
      createChart({ grid, container: '#mr',      type: 'movingRange', y: 'bore', title: 'Moving range' });
      createChart({ grid, container: '#cap',     type: 'capability',  y: 'bore', title: 'Capability against the tolerance' });
    },
    template: `
      <div id="tiles"></div>
      <div id="control"></div>
      <div id="pair">
        <div id="mr"></div>
        <div id="cap"></div>
      </div>
      <div id="grid"><lattice-grid ref="grid" v-bind="config" /></div>
    `,
  }).mount('#app');
</script>