demo D206

A fitted line in Svelte

Least squares per series, with R², agreeing with the API

fit: true

This draws a least-squares line through each series in a scatter, with R squared shown and matching the API. It puts a trend and its goodness of fit on the picture, so the strength of a relationship reads directly off the chart.

Building…

Loading a live grid…

This is the Svelte version. A use action attaches the grid to a plain element, so no framework runtime is passed in and the component stays small, while the configuration is ordinary Svelte state.

The configuration

<script>
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.esm.min.js';
  import createLatticeAction from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/svelte.esm.min.js';
  import { createChart } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/charts.esm.min.js';

  const lattice = createLatticeAction({ createGrid });

  let chartEl;

  const config = {
    rowKey: 'id',
    columns: [
      { field: 'symbol', title: 'Symbol' },
      { field: 'desk', title: 'Desk', filter: { type: 'set' } },
      { field: 'price', title: 'Price', type: 'number', format: { decimals: 4 } },
      { field: 'bid', title: 'Bid', type: 'number', format: { decimals: 4 } },
      { field: 'ask', title: 'Ask', type: 'number', format: { decimals: 4 } },
      { field: 'volume', title: 'Volume', type: 'number', format: { notation: 'compact' } },
      { field: 'notional', title: 'Notional', type: 'number',
        format: { style: 'currency', currency: 'USD' }, total: 'sum' },
    ],
    rows,  // instruments: symbol, desk, price, bid, ask, volume, notional
    // onGrid hands over the live grid the moment it is created. fit draws a
    // least-squares line per series, with R2 beside it, and the chart follows
    // the grid's filters and sort from then on.
    onGrid: (grid) => {
      createChart({ grid, container: chartEl, type: 'scatter', x: 'volume', y: 'notional', fit: true });
    },
  };
</script>

<svelte:head>
  <link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.min.css">
</svelte:head>

<div bind:this={chartEl} style="height: 340px"></div>
<div use:lattice={config} style="height: 340px; margin-top: 14px"></div>