[gradsusr] how to compute Threat score

sushant puranik sushantpuranik at gmail.com
Thu Dec 20 23:58:17 EST 2012

I wanted to find threat score.I have two datasets in two different columns
say i have rainfall data (actual observed) in one column and another column
contain model predicted rainfall.
So the formula  for equitable threat score (ETS)  is

ETS =  H / (F+M+H)

Where H = Number of grid points where model predicted rain and actual rain
F = number of grid point where model predicted rain but rain did not
M = Number of grid points where rain occurred but model failed to predict,

any suggestion??????

Thanking you

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