- Posts: 1107
- Joined: Tue Apr 02, 2013 12:40 am
Milleram,
There is more info on my website, (http://www.angelfire.com/games5/joethej ... ngsFAQ.htm) but here's some info:
This system has evolved over 20 years and there’s over a man-year of effort put into it. It’s not trivial. Initially, it was an OPS type system for hitting and pitching. Then fielding was incorporated.
The newest generation includes situational elements and "chain" assumptions. In other words, it takes into account how many times certain situations occur and then translates the situational probabilities into a rating based on the probability of an outcome on each card. It even takes into account the fact that some players hit into many double plays or that if someone is a good clutch hitter. The system is based on total bases. It looks at how often on average situations will occur and then measures the bases advanced by runners and the batter based on the outcome.
In the system, a point is awarded for each base a runner is advanced. So reaching first on a walk, single, or E1 gets you 1 base. We then looked at average situations occuring to determine how many bases an outcome impacts. For example, a walk will move up any forced runner. We sum up the probability of each situation that advances a runner by the # of runners advancing. For example, a home run will advance all the base runners. As stated before, we assume bases empty occurs 49.2% of the time. A runner on first only occurs 22.2% of the time. A home run will give 3 points for any runner on first so we multiply the probability of this occuring by 3. We do this for all possible situations to come up with the total bases factor that is the heart of the rating system.
One other note, the rating system is slightly different for hitters than pitchers. That's because a hitter's average situational occurance (number of runners on base) is independent of his card. Whereas, a pitcher's average situational occurance is dependent on his card. That is, a batter can't influence the outcome of the preceding batter, but a pitcher influences all outcomes as long as he's on the mound.
Defensive ratings, speed, steal, wild pitch, passed balls, hold and balks are all taken into consideration by the ratings.
How do you do the team ratings?
The method by which I rate a team is pretty general. For example, I take an educated guess at the number of innings pitched by all the relievers. For example, it is quite likely that your best set up guy will get more innings than the other guys including your closer. I also adjust for strong versus weak starting rotations and how many innings they'll get vis-a-vis the relievers.
Overall Rating - Sum of Starting Lineup points –( 9* the average pitcher rating)
The Average pitcher rating is:
(Aver Start rating) * %of anticipated starter innings + (Avg Rel rating)*(1-%of anticipated starter innings)
Start rating is computed by entering the anticipated number of starts for each starter and calculating the average from there.
Relief Ratings take into account how often a RP is expected to pitch. This is to compensate for the way Hal will (over) use setup and closers.
The starting lineup points take into consideration platoons on a 70/30 ratio.
Injury adjusted ratings are used in the calculation. These ratings are adjusted assuming a "standard" backup.
Bench is not considered.
Let me know if you have questions or comments. This is how we get better at rating players/teams!