View source: R/normal.lnormal.params.R
normal.params | R Documentation |
Function to calculate the equivalent values for the mean and standard deviation of a normal distribution from the mean and standard deviation of the log-normal distribution. Outputs from this function can be used with the dnorm() function, and with the normal distribution in JAGS.
normal.params(log.mean, log.sd, coeff.variation=sqrt(exp(log.sd^2)-1))
log.mean |
either a single value or vector of values for the mean of the lognormal distribution. |
log.sd |
either a single value or vector of values for the standard deviation of the lognormal distribution. Ignored if values are supplied for coeff.variation. |
coeff.variation |
either a single value or vector of values for the coefficient of dispersion. |
A list with elements representing the mean of the normal distribution, the standard deviation of the normal distribution, and the coefficient of variation.
lnormal.params
lmean <- 2.5
lsd <- 0.2
mean <- normal.params(lmean,lsd)[[1]]
sd <- normal.params(lmean,lsd)[[2]]
curve(dlnorm(x, lmean, lsd), from=0, to=25, col="blue")
curve(dnorm(x, mean, sd), from=0, to=25, add=TRUE, col="red")
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