Why Link the Accounts?
If you use Google Analytics for your website statistics and place Google AdSense advertisements you can link the two accounts. But why would you care? By linking the accounts you are provided with information on which pages are generating adsense revenue. After analyzing the information you can better optimize your site, your pages, and the adsense code itself (type of ads, colors, font etc.) to increase the adsense revenue from your site. Simply placing adsense code is not enough to maximize your revenue, you need to optimize to increase your revenue per page and ultimately per site.
Linking Google AdSense with Analytics
Within AdSense on the main page, after you login, you will find a link to connect the two accounts. If you already have Google Analytics you can choose that option, or if you do not it will allow you to create an account. If you do have an account the next screen will show you all the sites you have in your analytics account. You simply check which ones you wish to link and you are done. However, it will only work if your login email address for AdSense is the same as your login email address for Analytics. If they are different, then read on to connect the accounts.
What If You Login With Different Emails?
This is why I wrote this article. It is a little confusing if your logins for AdSense and Analytics are different. But here is the fix. You login to your analytics account and at the top you choose the link that reads Analytics Settings, then at the bottom of the page you choose to Add a User. Now when you add a user you have to add the email address that you use to login to your AdSense account and you MUST make them an Account Administrator.
Once you have set up that new user in Analytics, return to your AdSense Account. Now click the link again on the main page to link AdSense with Analytics. This time when you choose the option that states you already have an analytics account it will take you to the next page where you choose which site profiles you want to link. It now works because you created an administrator user on your Analytics account that matches the user login on your AdSense account.
That is it, now after a few hours once the two are linked by Google you can begin to analyze your account.