Arguments
label	type	description
fcst	variable or constant	deterministic forecast
obs	variable or constant	observations
Returns
bias	variable or constant	mean bias of deterministic forecasts fcst from observations obs

S grid for fcst and T grid for obs need be of the same nature. obs' [X Y] are regridded to fcst's [X Y] (see gridtomatch function). If one would like to do the other way around (i.e. the forecast regridded to the observations grid), it has to be done manually before applying bias_mean.

Example
SOURCES .IRI .FD .NCEP .Forecast .asst .ensemble .monthly .t2m
(Celsius_scale) unitconvert
SOURCES .UEA .CRU .TS2p1 .monthly .mean .temp bias_mean