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# Mets run factor: Jason Bay is instant offense

New York Mets left fielder Jason Bay (44) watches his ground rule double in the bottom of the fourth inning against the Houston Astros at Citi Field. (April 21, 2011) Photo Credit: Christopher Pasatieri

Jason Bay made his 2011 debut last Thursday, and he burned all the energy involved with an inside-the-park home run but little of the statistical glory.

Still, that four-base error gets him some credit in the Mets Run Factor (explain below the chart). In Bay's four games, he was taken over the MRF lead.

PLAYER G PA R RBI HR MRF/G MRF/PA
Jason Bay 4 17 3 3 1 1.250 .294
David Wright 22 97 18 14 5 1.227 .278
Ike Davis 22 91 11 18 4 1.136 .275
Jason Pridie 3 12 1 3 1 1.000 .250
Jose Reyes 22 104 16 6 1 0.955 .202
Carlos Beltran 21 79 13 9 3 0.905 .241
Daniel Murphy 19 53 6 8 1 0.684 .245
Willie Harris 20 59 7 7 1 0.650 .220
Angel Pagan 19 82 7 6 1 0.632 .146
Mike Nickeas 5 20 1 3 1 0.600 .120
Scott Hairston 17 31 4 5 1 0.471 .258
Josh Thole 19 67 3 4 0 0.368 .104
Justin Turner 4 10 1 0 0 0.250 .100
Lucas Duda 8 20 1 1 0 0.250 .100
Brad Emaus 14 42 2 1 0 0.214 .071
Chin-Lung Hu 11 12 2 0 0 0.182 .167

What is the Mets Run Factor?

The Mets Run Factor is a fairly simple statistical metric. It takes the "Runs produced" sabermetric created by Bill James and divides it in two different ways.

Equation 1

The first equation is R + RBI - HR / G = Runs produced per game, as indicated in the chart above as MRF/G.

Equation 2

The second equation is R + RBI - HR / PA = Runs produced per plate appearance, as indicated in the chart above as MRF/PA.

The Mets Run Factor is updated every Monday | Past Mets Run Factor reports.