Player or team performance is not a straight line of improvement

If we graph performance of a player or a team it is not a straight line showing improvement each day. Skills are developed over time and while the skill level will increase over time it will ebb and flow on the way. Also it will depend upon what we measure to show improvement. As we progress through the age groups the skills of the opposing players and teams improve. And as the opponent improves it is harder to use the typical measuring sticks, like batting average, era, on-base percentage, etc.

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