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Johnson curve fitting

version (6.36 KB) by Benjamin Levy
Fits a Johnson curve to data based on AS99, returns parameter estimates and curve type.


Updated 21 Sep 2006

No License

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.


x vector of sample observations

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

Cite As

Benjamin Levy (2022). Johnson curve fitting (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R13
Compatible with any release
Platform Compatibility
Windows macOS Linux

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