I’m going to pick up where I left off two weeks ago working on my chart of NFL team win percentages over time. Last week I focused on getting the infrastructure setup, which was much easier than I thought, and walking through a basic tutorial to get a line graph working in D3. This week I’m going to do some customization. Wins, Losses & Ties To get the chart working last week I simply calculated the win percentage for the Falcons for a few seasons and plugged this in. Realistically that isn’t scalable, I’ll want to be able to input data in the form of a W-L-T season record and have it render. To calculate a win % I will count each win as 1 point, loss as 0 points and tie as .5 points. I’ll then divide the sum by the total number of games to get a %.