The Fantasy Baseball Sherpa

This time of year many fantasy baseball team owners look to trades in an effort to improve their place in the standings.  Of course, everyone’s ideal is to trade away players who will perform worse over the remainder of the season than they have year-to-date, while simultaneously trading for players who will perform better over the remainder of the season than they have year-to-date.

How should you assess a player’s year-to-date value vs. his forecasted remainder-of season value?  Using Fantasy Baseball Sherpa’s In-season Updates tool, an owner can quantify both of these values in an effort to identify players who are currently undervalued and overvalued.  Fantasy Baseball Sherpa assigns a score of 1.00 Sherpa Points to the league leader in each category.  All other players are assigned a score for that category based on their result relative to the league leader’s result.

For example, if the league leader has hit 26 HRs year-to-date, then a player who has hit 13 HRs year-to-date would be assigned a scoreof 0.50 Sherpa Points.  For ratio categories (e.g.- AVG, ERA) a proxy statistic is used.  A player’s scores in each category can be added up to determine the player’s Total Sherpa Points.  A player’s maximum score is equal to the number of categories used (note:  this maximum score will be different for Hitters and Pitchers if your league uses a different number of categories for Hitters and Pitchers).

Here are 10 American League Pitchers who are good buy-low candidates for a league using the standard 5 Pitching categories (Wins, Saves, Strikeouts, ERA, & WHIP) based on stats through games of Sun 6/21/09:

1. John Lackey, SP, LAA (1.74 Remainder-of-Season Total Sherpa Points - 0.00 Year-to-Date Total Sherpa Points = +1.74)
2. CC Sabathia, SP, NYY (3.20 - 1.86 = +1.34)
3. Joakim Soria, RP, KC (2.08 - 0.83 =+1.25)
4. Ervin Santana, SP, LAA (0.70 - -0.42 = +1.12)
5. Scott Kazmir, SP, TB (0.45 - -0.45 = +0.90)
6. Rich Hill, SP, Bal (1.15 - 0.29 = +0.86)
7. Francisco Liriano, SP, Min (0.83 - 0.02 = +0.81)
8. Jonathan Papelbon, RP, Bos (2.31 - 1.51 = +0.80)
9. Mariano Rivera, RP, NYY (2.21 - 1.43 = +0.78)
10. Joba Chamberlain, SP, NYY (1.59 - 0.86 = +0.73)

Here are 10 American League Pitchers who are good sell-high candidates for a league using the standard 5 Pitching categories based on stats through games of Sun 6/21/09:

1. Edwin Jackson, SP, Det (1.21 - 2.50 = -1.29)
2. Kevin Millwood, SP, Tex (1.38 - 2.30 = -0.92)
3. Justin Verlander, SP, Det (2.00 - 2.58 = -0.58)
4. Scott Richmond, SP, Tor (0.80 - 1.36 = -0.56)
5. Jason Vargas, SP, Sea (0.32 - 0.88 = -0.56)
6. Drew Bailey, RP, Oak (1.35 - 1.90 = -0.55)
7. David Aardsma, RP, Sea (1.26 - 1.79 = -0.53)
8. J.P. Howell, RP, TB (0.79 - 1.30 = -0.51)
9. Scott Feldman, SP, Tex (0.61 - 1.12 = -0.51)
10. Josh Outman, SP, Oak (0.87 - 1.34 = -0.47)

Of course, there are a number of reasons why a player’s performance over the remainder of the season may vary significantly from his performance year-to-date, including normal variation in results, injuries, changes in roles, etc.  By attempting to quantify both a player’s year-to-date and remainder-of-season results, we can take at least some of the guesswork out of identifying buy-low and sell-high candidates.

I’ll take a look at NL Pitchers in my next post.

Until then,

The Sherpa

Fantasy Baseball Sherpa

The Fantasy Baseball Sherpa’s Blog

@fantasy_sherpa on Twitter

In this post I’ll take a look at the Top 10 Pitchers (both year-to-date and for the rest of the season) in an AL-only format (i.e. - Pitching categories are Wins, Saves, Strikeouts, ERA, and WHIP). Each player receives a Sherpa Point score ranging from 0 to 1 in each of the 5 categories; thus, the maximum possible score is 5.00.

For the counting statistics the league leader is assigned a score of 1.00; all other Pitchers’ scores are calculated by taking the ratio of their score in a particular category to the league leader’s score. For example, if the league leader has 15 Wins, a Pitcher with 10 Wins would receive a score of .67, a Pitcher with 5 Wins would receive a score of .33, etc. For average-based categories (e.g. - ERA and WHIP) a proxy statistic is used. Pitchers’ Sherpa Points scores in each individual category are added to calculate the Total Sherpa Points.

Top 10 Pitchers Year-to-Date

1. Cliff Lee - 3.71 (Remainder-of-Season forecast = 3.00 Sherpa Points, which ranks 3rd overall)
2. Roy Halladay - 3.61 (3.85, 1st)
3. Justin Duchscherer - 3.04 (2.80, 6th)
4. Ervin Santana - 2.72 (2.09, 20th)
5. James Shields - 2.58 (2.90, 4th)
6. Joe Saunders - 2.55 (1.64, 35th)
7. Mariano Rivera - 2.37 (2.80, 5th)
8. Mike Mussina - 2.32 (2.05, 21st)
9. Josh Beckett - 2.20 (2.78, 7th)
10. Felix Hernandez - 2.16 (2.77, 8th)
11. Scott Kazmir - 2.16 (2.67, 9th)

Top 10 Pitchers for Remainder of Season

1. Roy Halladay - 3.85 (Year-to-Date score = 3.61 Sherpa Points, which ranks 2nd)
2. John Lackey - 3.21 (1.97, 19th)
3. Cliff Lee - 3.00 (3.71, 1st)
4. James Shields - 2.90 (2.58, 5th)
5. Mariano Rivera - 2.80 (2.37, 7th)
6. Justin Duchscherer - 2.80 (3.04, 3rd)
7. Josh Beckett - 2.78 (2.20, 9th)
8. Felix Hernandez - 2.77 (2.16, Tied for 10th)
9. Scott Kazmir - 2.67 (2.16, Tied for 10th)
10. Daisuke Matsuzaka - 2.63 (1.94, 20th)

John Lackey’s year-to-date results are obviously hampered by the fact that he didn’t pitch his first regular season game until May 14th. Still, with three bad outings in his last four starts, he may be a buy-low candidate today. I would also consider Daisuke Matsuzaka a buy-low candidate at this point in the season. On the flip side, three Pitchers I would be looking to sell high on if I owned them: (1) Ervin Santana, (2) Joe Saunders, and (3) Mike Mussina.
In my next post I’ll take a look at the Top 10 Hitters in an NL-only format.

Until then,

The Sherpa