I installed the WordPress Stats plugin last week and hadn’t seen any data. For the first couple days I wasn’t too surprised, I just figured no one was coming to my site, but after a full week I started to get curious. After a little bit of looking at the code and reading the FAQ, I realized that the theme I am currently using wasn’t set up right. In the end, I just needed to add

<?php wp_footer();?>

to the bottom of my footer.php.