jQuery liScroller doesn't use $(document).ready(function() why?

I was wanting to implement this right to left CNN style newsticker

http://www.gcmingati.net/wordpress/wp-content/lab/jquery/newsticker/jq-liscroll/scrollanimate.html

Unlike most jQuery functions this one does not begin with $(document).ready(function()
});

liScroller function

$(function(){ 
    $("ul#ticker01").liScroll(); 
}); 

Assuming the creator of this tute and plugin knows alot more about jQuery than I do, I wanted to know is there a reason why not? Because my newsticker widget will ultimately be deployed via being inserted with a 3rd party include on a page that has other scripts that will load first, I already know from experience that the absense of $(document).ready(function() will cause an error in IE simply because the function attempts to use jQuery.js before it is fully loaded.