Calculates mu and sigma of lognormal from median and upper quantile.
getParmsLognormForMeanAndUpper(mean, quant,
sigmaFac = qnorm(0.99))expected value at the original scale
value at the upper quantile, i.e. practical maximum
sigmaFac=2 is 95% sigmaFac=2.6 is 99% interval
numeric matrix: columns mu and sigma parameter of the lognormal distribution.
There are two valid solutions. This routine returns the one with lower sigma, i.e. the not so strongly skewed solution.