Ed
I use the Cressie statistic to four significant figures as a guide in the interactive fitting, but generally end up using a visual judgement. It tracks as you drag the model around, so you can watch it change.
I think the 'real' visual objective function is probably the perpendicular (to tangent) distance to the model line, which is effectively the combination of both gamma and h. One should then be able to alter the relative weighting between distance and height. Haven't tried this yet.
Isobel
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