title: How to make "checked" on md-radio-button in Angular
body: <p>I need to check an <code>md-radio</code> button. I saw on their website that they do it in scope in <code>app.js</code> but need to do it dynamically. I have tried with <code>ng-checked</code> but didn't work.</p>
  
  <p>Is there any way to modify the javascript variable <code>data</code> of <code>$scope</code> to add the checked?</p>