Set checkboxes as checked using angularjs

Use ng-checked for check-boxes,

<label class="radio-inline">
  <input type="checkbox"  ng-model="newItem.have_voter_id"  value="have_voter_id" ng-checked="newItem.have_voter_id=='Y'"/><?php echo $this->lang->line('label_voter_id'); ?>
</label>

<label class="radio-inline">
  <input type="checkbox"   ng-model="newItem.have_passport" value="passport" ng-checked="newItem.have_passport=='Y'"/> <?php echo $this->lang->line('label_passport'); ?>
</label>