Modified ERA

[Mike_nyc]

What is it?

[Tavish]

I think the only formula I've actually seen referred to as "modified ERA" is:

ERA + ((L-W)/10)

Alot of times people will call a league/park/time adjusted ERA a pitcher's modified ERA as well so its hard to be real certain which version you are looking for.

[Ender]

If you are talking a component ERA where you end up with a value based on the pitchers ability rather than what actually happened there are a whole bunch of versions. I like Shandler's xERA the best myself.

(.575*H) + (.94*HR) + (.28*BB) + (.01*K) - Y

All of those numbers are per 9 IP, so if you K 10 guys every 9 IP the K value would be 10. Y is a normalization factor generally around 2.77, I have no clue how they figure that out.

What xERA doesn't do is adjust for fielding or ballpark, other stats are better for that but none of them are particularily good at it.

[Mike_nyc]

Appreciate the feedback, trying to tier my pitchers for this year and saw this category. Was interested in what it meant. Per your responses, it looks as if it is a combination of factors.