September 23, 2021

The 2020 ZiPS Projections | FanGraphs Baseball (FanGraphs)

The 2020 ZiPS projection season starts tomorrow, and before it does, I wanted to offer a brief refresher of what ZiPS is and is not.

ZiPS is a computer projection system, initially developed by me from 2002-2004, and “officially” released in 2004. As technology and data availability have improved over the last 15 years, ZiPS has continually evolved. The current edition of ZiPS can’t even run on the Pentium 4 3.0 processor I used to develop the original version starting in 2002 (I checked). There are a lot more bells and whistles, but at its core, ZiPS engages in two fundamental tasks when making a projection: establishing a baseline for a player, and estimating what their future looks like using that baseline.

ZiPS uses multi-year statistics, with more recent seasons weighted more heavily; in the beginning, all the statistics received the same yearly weighting, but eventually, this became more varied based on additional research. Research is a big part of ZiPS and every year, I run literally hundreds of studies on various aspects of the system to determine their predictive value and better calibrate the player baselines. What started with the data available in 2002…

Click here to read the whole article at FanGraphs