I implemented a custom unique visitor counter to my website developed in Codeigniter. The visitor counter is based on cookies similar to the following link http://webeasystep.com/blog/view_article/how_to_build_unique_visitors_counter_with_codeigniter
My cookie expiration time is 30 mins. When I compare my custom counts with Google analytics counts there is a large difference.
Can someone help me out to address this problem?