More bad information circulating on the Cafe! Sure the two are correlated, but the following quote is just bad adivce
TheRock wrote:See a guy with a mile-high WHIP but low ERA, he's been lucky. 4.80 ERA with a 1.2 WHIP, he's had a bad outing or two but he's making good pitches and the ERA should fall. Good time to buy low.
Have you ever thought about how walks and HRs have affected these two categories? A pitcher who gives up a lotta homers will have a worse ERA than his WHIP indicates. This is because HRs count the same as a single in the WHIP calculation, but obviously lead to more runs than a single, hurting an ERA more. The opposite (few homers lead to an era better than whip indicates) is also true. Also, a pitcher who walks a lot of batters will probably have a better ERA than his WHIP suggests. A walk counts the same as a HR in WHIP, so a lotta walks will inflate a WHIP, but since a walk could only drive in a run if it's bases loaded, it's not as harmful to a pitcher's era as a hit. And again, the opposite is true. This is of course all assuming everything else, like K rate, are equal. Thanks for listening, class is now dismissed.