afc.nn: 2AFC For Nominal Polychotomous Observations And Nominal...
In afc: Generalized Discrimination Score

Description Usage Arguments Details Value Author(s) References See Also Examples

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

1	afc.nn(obsv, fcst, m = 3)

`obsv`	vector with polychotomous observations (values in 1,..,m)
`fcst`	vector of same length as obsv with polychotomous forecasts (values in 1,..,m)
`m`	number of observation and forecast categories (default = 3)

This routine applies Eq.15 of Mason and Weigel (2009) to calculate the 2AFC.

p.afc

Value of Generalized Discrimination (2AFC) Score

Andreas Weigel, Federal Office of Meteorology and Climatology, MeteoSwiss, Zurich, Switzerland

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

afc

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

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