There are two standard parameters for the minimum extreme value distribution: Likeliest and Scale. The Likeliest parameter is the most likely value for the variable (the highest point on the probability distribution, or mode).
After you select the Likeliest parameter, you can estimate the Scale parameter. The Scale parameter is a number greater than 0. The larger the Scale parameter, the greater the variance.
The Scale parameter symbol is:
To calculate a more exact scale, you can estimate the mean and use the equation: