Webmasters or publishers have the option to integrate Google Adsense Account to Google Analytics. The Google Analytics integration helps to monitor AdSense earnings better.
But the important thing to note here is that – You can only link your AdSense account to one Google Analytics account at a time. Inside your Google Analytics account, you might have set profiles for different websites under different account labels. But since Google Adsense links only with one ‘Account’, the ideal way to arrange all websites of yours will be as under a single master account. There are provisions to track multiple profiles under an account name.