There are pages available in Windows SharePoint Services that will allow you to obtain usage statistics for WSS Sites. However, this is not the case for Areas in SharePoint Portal Server 2003. There are no built-in hyperlinks in the Admin pages for viewing usage statistics for a give Area.
Does this mean that usage statistics are not available for Areas in SPS 2003? No, it just means that you have to know a backdoor URL to get to the pages that display the stats. Here is the format of the URL:
http://{your portal name}/_layouts/1033/usageDetails.aspx
This URL will take you to a usage statistics page for the Home Area of your portal. (Note: the 1003 is the designator for you language, so it will be different if not using U.S. English).
If you want to look at usage statistics for a Subarea, for instance, News, you would modify the URL to look as follows:
http://{your portal name}/News/_layouts/1033/usageDetails.aspx
Happy analysis!