Bill James has
a fascinating article on his website (subscription required) tracking the stability of five different areas of baseball history (see key in the above graph) plus the overall stability measured as the average of the five factors. The data was calling out to me to be turned into a line graph, so here it is. I've used a rolling four year average trend line for the numbers James provided. (He didn't include the numbers for every year, just pointed out certain years in a narrative summary.)
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