From: Kristina Fröhlich <kristina_froehlich_at_nyahnyahspammersnyahnyah>
Date: Wed Apr 10 2013 - 09:47:03 MDT

Dear all, has anybody tried to calculate and plot a Talagrand diagram ? This is used to measure how an ensemble is able to catch the observed value. In the end one sees a histogram displaying the number observations for each ranked ensemble member per forecast. So for each forecast of a, e.g. 10 member ensemble the values are sorted by size and the observation is accumulated in the bin between the nearest two values. This means, I cannot simply use the histogram examples because there the bins are always fixed by a value while for a talagrand the bins are defined by the number of ensemble members while the DISTANCE between them will always change. The method would be, first to sort the values and then compare the observation values successively with the sorted values in order to decide in which bin to accumulate. The result can be plotted using the histogram I guess. Now I am stumbling over this comparison because I want to be flexible in terms of the number of ensemble members. My first attempts look like a long list of if statements which does not look very elegant and might also be error prone. I would be glad if somebody has a nice idea on that? So far I could not find a hint in the ncl talks or examples. Thanks in advance, best regards! Kristina

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Received on Wed Apr 10 09:48:19 2013

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