title: how to assign default value to the radio button in knockout
body: <p>I want to assign some values as a default value to the radio button When page loads<br>
  this is my code</p>
  
  <pre><code> &lt;input type="radio" name="year-end-method" 
      id="calendar-radio" 
      data-bind="checked: Selectedgroup.Yearendtype" value="Calendar"&gt; 
  </code></pre>
  
  <p>This does not works for me</p>
  
  <pre><code> $('input:radio[name="year-end-method"]    
   [value="RealTime"]').prop('checked', true);  
  </code></pre>