Winter '12 / '13 - Interim Standings 4

Under the ‘two-thirds’ rule…forecasters who have entered at least four forecasts are included in this season/s third Interim Standings.

SUMSQ errors for each contest storm are normalized with a 'Z-score'...then averaged...to compute the standings.  Lower (higher) average Z-scores indicate more (less) skillful forecasts.

If a forecaster has participated in more than two-thirds of all contests...then Z-scores from their 'best two-thirds' forecasts are used to calculate Interim and Final standings. More or less the same idea as dropping the lowest quiz score(s) before the final grade is computed.

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Complete table of Interim stats by Forecaster at the Contest/s web site here.
Forecaster summary storm data set here.