Mercurial > hg > nsaunier > traffic-intelligence

comparison python/utils.py @ 687:de278c5e65f6 dev

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
comparison
equal deleted inserted replaced
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):