Baseball Player Won-Loss Records
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Positional Avgs
User-Selected Positional Averages

As of February, 2019, users of this website are able to make their own choices of positional averages to be used in evaluating player values. A full discussion of positional averages and other aspects of player evaluation using Player won-lost records can be found in a 50-page PDF essay which I have written, Comparing Players Using Player Won-Lost Records.

This article gives a brief overview of the options available for calculating positional averages. These weights will be applied to offensive performance by position and for pitchers if different positional averages are desired for starting versus relief pitchers.

Positional averages will be calculated as a weighted average of four possible options using weights chosen by the user.

(1) 0.500 - i.e., all positions are treated equally.
(2) One-year positional averages. Positional averages will be calculated based on offensive performance by position within the season of interest.
(3) Nine-year positional averages. Positional averages will be calculated based on offensive performance by position within the season of interest as well as the four seasons immediately before and immediately after the season of interest.
(4) Long-run positional averages. Positional averages will be calculated based on offensive performance by position across all seasons for which Player won-lost records have been calculated.
In the past, I have chose option (2). In discussions - mostly online - this choice is somewhat controversial. I want to (a) be open-minded about issues of opinion - and one's choice of positional average is - while (b) trying to maximize the acceptance of the objective core of Player won-lost records - the wins and the losses. Hence, I have decided to allow users to choose their own positional averages. I don't want anybody to reject Player won-lost records because of my choice of positional average and I don't want debates about positional averages to get in the way of understanding the "objective truths" that Player won-lost records reveal via player wins and player losses.

On any page for which positional averages are presented or used in the underlying calculations, there will be boxes in which the user can enter any numbers desired associated with the four positional average options described above. Positional averages will then be calculated as a weighted average of the choices based on the numbers entered.

For example, entering values of 1, 2, 3, and 4 for options (1), (2), and (3), (4), respectively, would calculate a weighted positional average equal to (1/10) option 1 (10 = 1 + 2 + 3 + 4), (2/10) option 2, (3/10) option 3, and (4/10) option 4.

If the user does not enter anything, the default positional average weights options (2), (3), and (4) equally: (1/3) Option 2, (1/3) Option 3, and (1/3) Option 4.



All articles are written so that they pull data directly from the most recent version of the Player won-lost database. Hence, any numbers cited within these articles should automatically incorporate the most recent update to Player won-lost records. In some cases, however, the accompanying text may have been written based on previous versions of Player won-lost records. I apologize if this results in non-sensical text in any cases.

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