Some things are great by themselves, but together they are even better. Peanut butter and chocolate: Reese Cups. Chips and cheese: nachos. Vodka and tomato juice: Bloody Mary. Man and spouse: chicka-chicka-bow-bow. Well, today I will take two of favorite baseball topics, aging curves and injuries for hitters, and combine them in an aging curve based on injury history.
A few years ago, I found one issue with projections, they did not know if a player played through an injury during the season. If a batter played through an injury, the next season the player would, on average, exceed his projection. The player was most likely to see an improvement in the power department.