arisService.getVarStatData(
                JSON.stringify($scope.payload),
                JSON.stringify($scope.config.index_info),
                field,
                stat
                )
                .then(function (data) {

                    $scope.varStat = data;

                    console.log("var stat data", $scope.varStat);
                });

function getVarStatData(payload, index, field, stat) {

        for (var i = 0; i < field.length; i++) {
            if (field[i]) {

                var varStatData = {
                    user_selection: payload,
                    index_info: index,
                    field: field[i],
                    statistic: stat

                };

                postStatData(varStatData);

            }
        }
    }

    function postStatData(varStatData){
        var deferred = $q.defer();

        $http({
            url: 'API',
            method: "POST",
            data: $.param(varStatData),
            headers: {'Content-Type': 'application/x-www-form-urlencoded'}
        }).then(function (response) {
            var varStat = response.data;

            console.log("variable stat response data", varStat);

            deferred.resolve(varStat);
        });

        return deferred.promise;

    }