Originally posted on Mets360.com  |  Last updated 2/20/12
At Mets360 we hold these truths to be self-evident: • That proper statistical evaluation is essential to understanding how baseball games are won and lost • That the stats that are available today are superior to the ones available in the 1950s for this purpose • That there is no one perfect stat to evaluate players The closest we have to a perfect stat is WAR, which attempts to put all of a player’s contributions into one number to indicate how much value he created towards team success. Just to be clear, WAR is not perfect. But it is extremely reliable, which makes it extremely useful. As you might recall from your math classes, correlation is the measure of the relation between two or more variables. Correlation ranges from (-1) to +1, where positive 1 means perfect correlation, which we rarely find. Generally, a correlation of 0 means that the two variables have no correlation, a positive number less than 0.5 implies a weak correlation and a value of 0.8 or greater means the...
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