demo D206

A fitted line in React

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 React version. The grid mounts through the createLatticeGrid adapter, which takes its configuration as ordinary props and hands back the live grid through a ref. The grid below is the same one every other tab runs.

The configuration

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

<div id="app"></div>

<script type="module">
  import React from 'https://esm.sh/react@18';
  import { createRoot } from 'https://esm.sh/react-dom@18/client';
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.esm.min.js';
  import { createLatticeReact } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/react.esm.min.js';
  import { createChart } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/charts.esm.min.js';

  const { LatticeGrid, LatticeChart } = createLatticeReact({ React, createGrid, createChart });

  const columns = [
    { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
    { field: 'desk', title: 'Desk', filter: { type: 'set' } },
    { field: 'price', title: 'Price', 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' },
  ];

  const rows = [/* trading records, one per instrument */];

  function App() {
    const [grid, setGrid] = React.useState(null);

    // fit draws a least-squares line through the points, per series, with
    // its R2 beside it. The fit recomputes over whatever the filters leave.
    return (
      <>
        {grid && <LatticeChart grid={grid} type="scatter" x="volume" y="notional" fit title="Notional against volume, fitted" style={{ height: '340px' }} />}
        <LatticeGrid
          rowKey="id"
          columns={columns}
          rows={rows}
          onGridReady={setGrid}
          style={{ height: '320px', marginTop: '14px' }}
        />
      </>
    );
  }

  createRoot(document.getElementById('app')).render(<App />);
</script>