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minor comments for lognormal parameters (numpy and usual names differ)
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Mon, 22 Jun 2015 15:27:33 +0200
parents cdee6a3a47b4
children 9990ef119bce
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686:cdee6a3a47b4 687:de278c5e65f6
25 ######################### 25 #########################
26 # Simple statistics 26 # Simple statistics
27 ######################### 27 #########################
28 28
29 def logNormalMeanVar(loc, scale): 29 def logNormalMeanVar(loc, scale):
30 '''location and scale are respectively the mean and standard deviation of the normal in the log-normal distribution
31 https://en.wikipedia.org/wiki/Log-normal_distribution'''
30 mean = exp(loc+(scale**2)/2) 32 mean = exp(loc+(scale**2)/2)
31 var = (exp(loc**2)-1)*exp(2*loc+scale**2) 33 var = (exp(loc**2)-1)*exp(2*loc+scale**2)
32 return mean, var 34 return mean, var
33 35
34 def sampleSize(stdev, tolerance, percentConfidence, printLatex = False): 36 def sampleSize(stdev, tolerance, percentConfidence, printLatex = False):