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How can compute "Mean Absolute Error (MAE)" by CDO

I did not find as a new student how to calculate "Mean Absolute Error (MAE)" by CDO! Can you assist us with how to compute by CDO!

Solution

  • if you have your observations (or analysis?) in obs.nc and model in model.nc then you can calculate the MAE in the following way

    # calculate the difference 
cdo sub model.nc obs.nc diff.nc   

# absolute value
cdo abs diff.nc abs.nc 

# time mean
cdo timmean abs.nc MAE.nc

    or piping it all in one line:

    cdo timmean -abs -sub model.nc obs.nc MAE.nc

    If instead of the temporal mean you need the spatial MAE then of course you replace timmean with fldmean