Johnson curve fitting

Fits a Johnson curve to data based on AS99, returns parameter estimates and curve type.

Implements Carnegie-Mellon STATLIB/Applied Statistics AS-99 for fitting Johnson curve pdfs and developed by:

Hill, I.D., R. Hill, and R.L. Holder, 1976. Algorithm AS 99: Fitting Johnson Curves by Moments, Applied Statistics, Vol. 25, No. 2, 180-189.

[gamma,delta,lambda,xi,jctype,fault_msg]=cmu_as99_johnson_pdf_off_line(x)

Input:
x vector of sample observations

Output:
Parameter names as in AS-99.
Johnson curve parameters:
AS-99 Hahn-Shapiro
gamma gamma
delta eta
xi epsilon
lambda lambda

Johnson curve type and error state: jctype, fault_msg