Checks if the current user if has admin privileges, otherwise load ga.js. Don't forget to change your Analytics ID. See http://nmecdesign.com/?p=57 for more info.

no ga.js for wp-admin.phtml

<?php if (current_user_can('manage_options')) { ?>
	<a href="<?php echo admin_url(); ?>">Admin</a>
<?php } else { ?>
	<script>
		(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
		(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
		m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
		})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
		
		ga('create', 'UA-000000', 'auto');
		ga('send', 'pageview');
	</script>
<?php } ?>