title: How to create one group with multiple dimension on dc.js
body: <p>I am trying to create data visualization using <a href="https://dc-js.github.io/dc.js/" rel="nofollow noreferrer">dc.js</a> library.</p>
  
  <p>But my data has multiple value fields.</p>
  
  <p>So here my part of data:</p>
  
  <pre><code>[{"_1000_1249":0,"_1250_1499":2},{"_1000_1249":1,"_1250_1499":2},{"_1000_1249":2,"_1250_1499":3}]
  </code></pre>
  
  <p>I want to create group with the data keys like this(calculating sum of data):</p>
  
  <ul>
  <li>"_1000_1249":<strong>3</strong>,(sum of "_1000_1249") </li>
  <li>"_1250_1499":<strong>7</strong>,(sum of "_1250_1499")</li>
  </ul>
  
  <p>So How can I create dc.js row chart like this?</p>
  
  <p>Thanks</p>