Nearly 2 years ago, I created a FanPost calculating this new stat I had created while playing around. To see a more in depth explanation of the practicality and math behind CIRE, you can read that FanPost here.
How has the A's rotation been fairing with this stat? The formula for CIRE= [ORC*(9/IP)] where ORC= (H+W)*TB/(AB+W), or the Bill James runs created formula.
ORC= Opposing Runs Created
MLB ORC= (39481+15794)*66516/(161941+15794)= 20686.26
[20686.26*(9/42615)]= 4.37 CIRE
League ERA= 4.27, so adjusted to ERA, CIRE*.98= xCIRE (Don't know if this is the exact correct way to use "x", but just using it for the sake of differentiation)
Chris Bassitt (3.15 ERA) ORC= (127+39)*203/(583+39)= 54.18
[54.18*(9/157.1)]*.98= 3.03 xCIRE
Frankie Montas (3.37 ERA) ORC= (164+57)*263/(707+57)= 76.08
[76.08*(9/187)]*.98= 3.58 xCIRE
Sean Manaea (3.91 ERA) ORC= (179+41)*291/(702+41)= 86.16
[86.16*(9/179.1)]*.98= 4.23 xCIRE
Cole Irvin (4.22 ERA) ORC= (195+42)*301/(710+42)= 94.86
[94.86*(9/178.1)]*.98= 4.68 xCIRE
James Kaprielian as starter (3.80 ERA) ORC= (96+40)*175/(418+40)= 51.97
[51.97*(9/111.1)]*.98= 4.11 xCIRE