When you call up a website, a cookie may be saved on your browser.
By choosing corresponding settings in your web browser, you can prevent the storage and the transmission of cookies.
Cookies which have been saved may be deleted at any time. You would be able to find out how to manage cookies or deactivate them, among other things in your browser.
You can use the following add-on to disable Google Analytics.
Google Analytics Opt-out Browser Add-on