How would one go about calculating their own NFL stats? For instance, I want to calculate the percentage total possible yards a team could have traveled if they had scored a TD on every drive.
Basically, total offensive yards / the sum of all (100 - starting field position)
You need to find a useful source of data for your statistics. Pro-football-reference.com is a good one to start with. They have a lot of different statistics available.
In your case, you could look at the box scores for individual games; see this example. Towards the bottom are the drive statistics, which include all of the starting drive positions for both teams.
If you need help reading them in, post a question on StackOverflow, or better yet look around for articles and instructions for doing so, which are plentiful.
