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calculation standard deviation and variation in addhours
- To: http://www.tell_me.com/~robert
- Subject: calculation standard deviation and variation in addhours
- From: http://dummy.us.eu.org/robert (Robert)
- Date: Fri, 24 Sep 2010 07:46:48 -0700
sd = (high - low) / 6
var = total(sd) ^ 2
expected = (low + 4*mid + high) / 6
totalsd = sqrt(var)
95% confidence = total(expected) + totalsd * 2
http://www.interventions.org/pertcpm.html