How to change the Change/Assign Dropdown/Radio Button Values in Jquery Mobile

Method #1 ( DropDown )

var countrySetValue = $("#deliveryMethod");

$('#deliveryMethod').val('-1');

countrySetValue.selectmenu("refresh", true);

Method #2 ( DropDown )

$("#deliveryMethod").selectmenu("refresh", true);

Method #1 ( Radio Button )

$('input[name=PaymentType]').removeAttr('checked').checkboxradio("refresh");