get the mode of a log-normal distribution
getLognormMode(mu, sigma)
center parameter (mean at log scale, log(median))
scale parameter (standard deviation at log scale)
the mode
# NOT RUN {
# with larger sigma, the distribution is more skewed
# with mode further away from median = 1
getLognormMode(mu = log(1), sigma = c(log(1.2),log(2)))
# }
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