search for: sd_x

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2008 Apr 01
1
set the lower bound of normal distribution to 0 ?
...I am using 'urlnorm' which allows sampling from truncated distribution since I want the samples to take values from 0 to the max(x) respectively max(y). I am unsure how to specify the means and standard deviations in 'urlnorm'. Based on x- and y-values I have standard deviations sd_x=0.3372137, sd_y=0.5120841 and the means mean_x=0.3126667 mean_y=0.4223137 which are not on log scale as required in urlnorm. To covert sd_x, sd_y and mean_x, mean_y on a log-scale I did sd_logx=sqrt(log(1.3372137))=0.54, sd_logy=sqrt(log(1.5120841))=0.64, mean_logx=-(0.54^2)/2 and mean_logy=-(0...