xfip: xFIP

In peterxeno/sabermetrics-package: Sabermetrics Functions for Baseball Analytics

Description

xFIP is a statistic that estimates a pitcher's expected run prevention independent of the performance of the defense.

Usage

xfip(flyballs, lgHRFB, BB, HBP, K, ip, year)

Arguments

flyballs	Fly balls allowed
lgHRFB	League HR/FB Percentage
BB	Balls Allowed
HBP	Hit By Pitches Allowed
K	Strikeouts
ip	Innings Pitched
year	Season

Details

xFIP is almost exactly like FIP, except it uses the expected number of home runs taking the pitcher's fly balls allowed times the league average home run per fly ball rate.

Value

Returns a numeric value equal to (13*(flyballs*lgHRFB)+(3*(BB+HBP))-(2*K))/(ip)+constant

Note

Innings Pitched (IP) is commonly reported with .1 indicating 1/3 of an inning and .2 indicating 2/3 of an inning. In order for this function to be accurate, please change the decimal to .333 for 1/3 of an inning and .666 for 2/3 of an inning.

Author(s)

Peter Xenopoulos

References

http://www.fangraphs.com/library/pitching/xfip/

See Also

fip,xfipminus

Examples

## The function is currently defined as
function (flyballs, lgHRFB, BB, HBP, K, ip, year) 
{
    constant <- linearWeights$cFIP[which(linearWeights$Season == 
        year)]
    xfip <- (13 * (flyballs * lgHRFB) + (3 * (BB + HBP)) - (2 * 
        K))/(ip) + constant
    return(xfip)
  }

peterxeno/sabermetrics-package documentation built on May 25, 2019, 2:10 a.m.