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...for the totals over all the samples? I am a bit rusty on figuring out how error propagates through model calculations (an online reference for this would be handy, if you know of one). Thanks Ted -- View this message in context: http://www.nabble.com/How-to-get-estimate-of-confidence-interval--tp20073921p20073921.html Sent from the R help mailing list archive at Nabble.com.