angularjs - How to ng-checked checkbox in ng-repeat? -

i have list display user reputation census. sigle option radio button use code , work great when user answer , when return on same question check previous answer.

<li ng-repeat="item in items">     <input name="myname" value="{{item.id}}" type="radio"       ng-selected="mymodel==item.id" ng-model="mymodel"/>{{item.text}} </li> 

but multiple option i've use check box , don't know how write code mantain checked previous answer. use code doesn't work:

<li ng-repeat="item in items">     <input name="myname" checklist-value="{{item.id}}" type="checkbox"       ng-checked="mymodel==item.id" checklist-model="mymodel"/>{{item.text}}  </li> 

any help, please?

update

now have model array multiple value inside (mymodel). following code i'm not able check correct items.

<li ng-repeat="item in items"> <input name="myname" checklist-value="{{item.id}}" type="checkbox"   ng-checked="mymodel[$index]==item.id" checklist-model="mymodel"/>{{item.text}} </li> 

where error? thanks

try following snipet

<li ng-repeat="item in items">     <input name="myname" type="checkbox"  ng-model="ngmodel"      ng-checked="mymodel===item.id"  ng-true-value="{{item.id}}"/>{{item.text}}  </li>