Quote:
Originally Posted by pgjocki
Something I've seen that does mimic real life is that a reliever can be lights out one year then complete garbage the next.
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This is why I don't think SIERA is the right number to use for evaluating players year-to-year. SIERA does a great job of summarizing career numbers, but I've found it can be misleading when evaluating younger pitchers or those with less playing time.
I noticed in The 2023 Bill James Handbook (authored by SIS), they make no mention of specific advanced stats for relief pitchers. They focus on the following categories for relief pitchers: usage, inherited runners, saves, relief results. Each category then has multiple numbers below it. For example, usage has relief appearances, early entry, consecutive days, long appearances, and leverage index. I called out the usage category because in real life, usage is a huge piece of the puzzle for building a bullpen year-to-year. I'm not sure whether or not that translates to the game.
I can share the other stats for other categories as well if it's something y'all are interested in.