By default, the lognormal distribution uses the arithmetic mean and standard deviation. For applications where historical data are available, it is more appropriate to use the logarithmic mean and logarithmic standard deviation or the geometric mean and geometric standard deviation. These options are available from the Parameters menu in the menubar. Note that the location parameter is always in the arithmetic space.
For more information on these alternate parameters, see "Lognormal distribution" in the "Equations and Methods" chapter of the online Oracle Crystal Ball Statistical Guide. For more information about this menu, see Alternate Parameter Sets.