gm = games started

avgIP/gm =  ( Innings Pitched) / (games started)

% of a game pitched = (avgIP/gm) / (9 Innings)

avgER/gm  = (Players ERA) * ( % of game pitched )

2orUnder =  number of games the player allowed 2 or less ER's in a game.he started.

3orUnder = number of games the player allowed 3 or less ER's in a game he started

Player   gm   ERA   avgIP/gm   avgER/gm    2orUnder     3orUnder

"Z"         30     3.9        6.27           2.8                17                  20

Demp    33      3.0       6.25           2.0                 22                 28

"Z"  14W   6L                      Demp 17W   6L

"Z' had less than   5 IP    four times

Demp                                one time

They each had run support of 5 or more runs per game  17 times

ERA by itself carries little meaning.

Variance such as in the "Z" stats indicates a problem.  In his case, judging by the IP when good, it probably indicates injury.

Variance such as that exhibited by Marquis over the past 3 yr's probably indicated a problem with fatigue caused by usage patterns.