afc (version 1.4.0)

afc.mm: 2AFC For Ordinal Polychotomous Observations And Ordinal Polychotomous

Description

Routine to calculate the Generalized Discrimination Score (aka Two-Alternatives Forced Choice Score 2AFC) for the situation of polychotomous observations (ordinal) and polychotomous forecasts (ordinal)

Usage

afc.mm(obsv, fcst, mv = 3, mf = 3)

Arguments

obsv

vector with polychotomous observations (values in 1,..,mv)

fcst

vector of same length as obsv with polychotomous forecasts (values in 1,..,mf)

mv

number of observation categories (default = 3)

mf

number of forecast categories (default = 3)

Value

p.afc

Value of Generalized Discrimination (2AFC) Score

Details

This routine applies Eq.14 of Mason and Weigel (2009) to calculate the 2AFC.

References

S.J. Mason and A.P. Weigel, 2009. A generic verification framework for administrative purposes. Mon. Wea. Rev., 137, 331-349

See Also

afc

Examples

  #Forecasts and observations of Nino-3.4 index
  #Load set of polychotomous observations (4 categories) and polychotomous forecasts (4 categories)
  data(cnrm.nino34.mm)
  obsv = cnrm.nino34.mm$obsv
  fcst = cnrm.nino34.mm$fcst

  #Calculate skill score
  afc.mm(obsv,fcst,4,4)

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