4PL fit failure
I am trying to get to the bottom of an odd observation when trying to fit data using a 4PL. In short, when I fit my data I end up with a flat line: If I do any of the following I end up with a more proper looking fit, and I am sure that other minor changes to the numbers themselves may also fix this bug:Change 0.08 to 0.0800000001Change 26042 to 26043Invert the way the data is within the table (w...
landon
johnmoore