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...to estimate return values. I was wondering how/if I can calculate upper and lower confidence (CI_u, CI_l) intervals for each return frequency using the GEV parameters to fill-in the table below? Xi (location) = 35.396 Alpha (scale) = 1.726 Kappa (shape) = 0.397 Year, Return value, CI_u, CL_l 2, 36.0, 5, 37.3, 10, 38.0, 25, 38.5, 50, 38.8, 100, 39.0, Thank you for your help/suggestions, Doug -- --------------------------------- Douglas M. Hultstrand, MS Senior Hydrometeorologist Metstat, Inc. Windsor, Colorado voice: 970.686.1253 email: dmhultst at metstat.com web: http://www.metstat...