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** Walks plus hits per inning pitched **

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In baseball statistics, *walks plus hits per inning pitched* (*WHIP*) is a
sabermetric measurement of the number of baserunners a pitcher has allowed
per inning pitched. Since WHIP reflects a pitcher's propensity for allowing
batters to reach base, a lower WHIP indicates better performance. WHIP is
calculated by adding the number of walks and hits allowed and dividing this
sum by the number of innings pitched.

The stat was invented in 1979 by writer Daniel Okrent, who called the
metric "innings pitched ratio" at the time. Okrent excluded hit batsmen
from the numerator of baserunners allowed since Sunday newspapers did not
include hit batsmen in their statistical updates.^[1] WHIP near 1.00 or
lower over the course of a season will often rank among the league leaders
in Major League Baseball (MLB).

While earned run average (ERA) measures the runs a pitcher gives up, WHIP
more directly measures a pitcher's effectiveness against batters. Unlike
ERA, WHIP accounts for pitcher performance regardless of errors and
unearned runs.

WHIP is one of the few sabermetric statistics to enter mainstream baseball
usage. (On-base plus slugging, or OPS, a comparable measurement of the
ability of a hitter, is another example.) It is one of the most commonly
used statistics in fantasy baseball and is standard in fantasy leagues that
employ 4×4, 5×5, and 6×6 formats.

The lowest single-season WHIP in MLB history is 0.7373 from Pedro
Martínez pitching for the Boston Red Sox in

Source: en.wikipedia.org/wiki/Walks_plus_hits_per_inning_pitched

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