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Thread: Crystal Ball End-of-Season ERAs

  1. #1
    Member texasdave's Avatar
    Join Date
    Oct 2005

    Crystal Ball End-of-Season ERAs

    I ran across an interesting little toy on the Replacement Level Yankees Weblog and thought it was worth sharing. It is a formula that calculates the end-of-season ERA based on the present ERA of a pitcher, the expected number of additional innings to be pitched and the peripheral numbers needed to figure out a pitcher's FIP. FIP is much like DIPS. It takes the a pitcher's statistics that are not affected by the defense and it calculates the pitcher's ERA based on that. So basically this calculator takes the number of innings presently pitched at the present ERA and mixes it with the FIPS ERA based on how many additional innings each pitcher is expected to throw.

    Harang	220	4.22	3.32	3.65
    Arroyo	220	4.01	3.69	3.79
    Belisle	190	4.26	3.27	3.63
    Lohse	190	4.59	3.85	4.11
    Milton	100	5.17	4.59	4.77
    Weath    72	4.13	2.29	2.90
    Coffey	 72	4.94	5.83	5.53
    Stanton	 54	5.41	3.42	4.08
    Coutlan	 54	4.91	4.76	4.81
    Saarlo	 69	7.04	4.90	5.61
    Santos	 90	4.45	6.54	5.84
    The first column (TXIP) is a rough estimate of how many innings each pitcher is expected to pitch in 2007. The second column (ERA) is their ERA at the approximate 1/3 pole of the season. The third column (RXERA) is their expected FIP ERA for the remaining 2/3 of the season based on the pitcher's peripherals. And the fourth column (TXERA) is the mix of columns two and three. In other words it is the calculated end of season ERA. This is based upon the pitcher's peripherals staying at the same rate for the remainder of the season. Of course injuries, changes of role, trades and usage can affect these numbers, but it will be interesting to see how close this comes to the actual end-of-season ERA. All five Reds starters could likely see improvement. The bullpen is more of a mixed bag.

    I ran all 16 NL teams through this same calculator. IMO the results seemed to lend some credence to the ERA calculator. The average team change for the rest of the season was pretty close at .04. I don't know much about DIPS and FIP etc. But they seem to be fairly accurate assessors of pitching ability.

    SDP	2.97	3.17	0.20
    NYM	3.40	4.06	0.66
    LAD	3.48	3.40	-0.08
    ARI	3.70	3.98	0.28
    SFG	3.75	3.99	0.24
    MIL	4.04	4.05	0.01
    CHC	4.09	4.22	0.13
    ATL	4.15	4.15	0.00
    FLA 	4.38	4.38	0.00
    HOU	4.39	4.40	0.01
    PIT	4.51	4.55	0.04
    WSN	4.51	4.66	0.15
    CIN	4.62	4.16	-0.46
    PHI	4.62	4.53	-0.09
    COL	4.65	4.46	-0.19
    STL	4.69	4.46	-0.23
    AVERAGE +/-			0.04
    Once again the first column (ERA) is the present ERA. The second column (TXERA) indicates what the calculator thinks the ERA will be at the end of the year based on a team's pitching numbers. (insert injuries, etc disclaimer here) The numbers show that the Reds pitching staff should rebound in the final 2/3s of the season. That, based on HR, BB and K rates, better days should be ahead. Note: a negative number in the DIFF column means ERA improvement is likely for that particular team. That is always a good thing. Teams that may tumble a bit include the Mets, Giants, the D-Backs and the Nats.

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  3. #2
    Member klw's Avatar
    Join Date
    Jan 2005
    New England

    Re: Crystal Ball End-of-Season ERAs

    Interesting. I was just looking at stats over at ESPN and thought it showed that similar possibilities of improvement. Unfortunately I hadn't looked here so I started another thread. Now it would seem that either the pitching will improve or that for some flaw in the makeup in the staff it will underperform for the whole season.

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