search for: johnsonfit

Hello, I was trying to fit a Johnson curve by first figuring out the parameter estimates using JohosnFit of a vector by a group ID using the aggregate function. I.E. aggregate(x, by = list(ID), JohnsonFit) where x is the variable I am trying to perform JohnsonFit on. It is a continuous random variable. However, I keep getting the following error: Error in JohnsonFit(x) : Unbounded solution intermediate values out of range When I run the fit individually by group ID, it works fine. However I do no...

Hi all; I'm working with the library SuppDists trying to fit a Johnson's Sb distribution to a dataset. It works fine, but I need to set one of the location parameters (epsilon) to zero. How can I do this using the function JohnsonFit() or any other similar? ...and Is it possible to define the type (SN,SL,SB,SU) or the library assumes the type automatically depending on the data? Thanks for any hint Christian

Dear R users, I hope to explain the concepts of skewness and kurtosis by generating series of distributions with same skewness and different kurtosis or with same kurtosis and different skewness, but it seems that i cannot find the right functions. I have searched the mailing list, but no answers were found. Is it possible to do that in R? Which function could be used? Thanks a lot. --