JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://knockoutjs.com/downloads/knockout-2.2.1.debug.js"></script>
<div data-bind="foreach: choices">
    <div>
        <input type="radio" name="choices" data-bind="value: $data, checked: $parent.selectedChoice" />
        <span data-bind="text: $data"></span>
    </div>
</div>
<div data-bind="text: ko.toJSON($root)"></div>

JavaScript

var viewModel = {
    choices: ["Nie", "Täglich", "Wöchentlich"],
    selectedChoice: ko.observable("Täglich")
};

ko.applyBindings(viewModel);