Where to put a Website Analytics Embed Code

Where to put a Website Analytics Embed Code in the site?

<script type='text/javascript'>
(function() { var zanalytics_ = document.createElement('script');
zanalytics_.type = 'text/javascript';
zanalytics_.async = false;
zanalytics_.src = ('https:' == document.location.protocol ? 'https://s3.amazonaws.com/' : 'http://') + 'dynamic.ziftsolutions.com/analytics/8acf1005537e76d001537ea0c206000b.js';
document.getElementsByTagName('script')[0].parentNode.appendChild(zanalytics_);
})();
</script>