Normalization
Posted: Wed Jan 20, 2016 11:00 pm
Just curious how SOM normalizes it's stats (and apologizing in advance for a long post )
For a season it's simple, use the current season to normalize stats. So if the league average is .260 and someone hits .280, The average on their SOM card will relect a .300 average to compensate for only influencing the result 50% of the time.
If we look at a deadball period, use 1906 National league for example would have a "norm" of one HR per 320 at bats. Take Tim Jordan, one of the leading HR hitters that season (1906 Brooklyn), and he would be a HR per 44 at bats. He would then hit a HR per 23.6 at bats on "his" SOM card. Put him against modern era pitching of about one HR per 24 AB and he will hit about 20 HR in a 550 AB season.
One of the biggest problems is normalizing someone like Babe Ruth, in particular in the early 20's. With a league average of a HR per 89.7 AB's in 1921 AL, and Ruth with a HR per 9.2 AB's, his "card' for SOM would have to be 1 HR every 4.8 AB's to normalize for that season. Against closer to historical 1 HR per 36 B's, he would hit 1 HR per 8.5 AB's. In a 540 AB season like he had in 1921, it would be 64 Homeruns.
It's not that bad, I've always felt though that for normalization it would make sense to use the mean of MLB historical numbers averaged with that particular season. I think it works better when putting together players of different eras.
Anyone know what SOM use for it's normalization?
For a season it's simple, use the current season to normalize stats. So if the league average is .260 and someone hits .280, The average on their SOM card will relect a .300 average to compensate for only influencing the result 50% of the time.
If we look at a deadball period, use 1906 National league for example would have a "norm" of one HR per 320 at bats. Take Tim Jordan, one of the leading HR hitters that season (1906 Brooklyn), and he would be a HR per 44 at bats. He would then hit a HR per 23.6 at bats on "his" SOM card. Put him against modern era pitching of about one HR per 24 AB and he will hit about 20 HR in a 550 AB season.
One of the biggest problems is normalizing someone like Babe Ruth, in particular in the early 20's. With a league average of a HR per 89.7 AB's in 1921 AL, and Ruth with a HR per 9.2 AB's, his "card' for SOM would have to be 1 HR every 4.8 AB's to normalize for that season. Against closer to historical 1 HR per 36 B's, he would hit 1 HR per 8.5 AB's. In a 540 AB season like he had in 1921, it would be 64 Homeruns.
It's not that bad, I've always felt though that for normalization it would make sense to use the mean of MLB historical numbers averaged with that particular season. I think it works better when putting together players of different eras.
Anyone know what SOM use for it's normalization?