On 2/25/2009 4:30:20 PM, wschrabi wrote:
>Thanks a lot, but please check
>my new worksheet in my last
>post(one previos)
>Thanks
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No idea what you want me to check. You must admit the following: some model functions can't be minerred by no CAS, no maths. They are not commonly found except in my library. The model function that pertains to the project does Minerr with a large range of approximate values, this model is robust. It only takes a bit of experience to master it. For instance the 1rst block can take as initials ... 0.1, 1, 0, 1 and you will get the fit. The 2nd block can take ... 1, 1, -0.1, -0.1 and you get the fit. You might not always get the exact same coefficients at full numerical accuracy, but is not needed as the data set is only 4 digits, so 5 digit figures in the coefficients is plenty in that project, and it is recommended the user truncates some of them.
Generally, because the PWMinerr you are using is so powerful and robust it is not needed to TOL, CTOL otherwise than the default 0.001.
Another aspect is about the exp models: they are "reflexive" (not reflective), it means the coefficients might switch tail to end and still get the fit.
Next to meditate: this model fits this data set and as such will fit a family of data set of different experiment but of same physico-chemical nature. Attach data set of 'n' number of columns and you will get back a complete set of fitting coefficients.
The most important point you must accept is that a data set is a data set and the fitting model is a fitting model . The fitting model is a scalar transformation and the fitting coefficients belong to the model. They have no relationship with the data set except if one finds such a relationship. The model is in the scalar domain, the data set is in the measurement domain.
If you have some safe procedure to collect the relevant DE parameters, then run the DE Minerr, then crate a data set from it, then Minerr for the fitting coefficients.
Nothing in the web about InuSoft, ModKine. Proprietary software, probably not traceable except by peoples versed in decoding. For that kind of project, Mathcad is foolproof and traceable to sources.
Please, feel free to ask + questions.
jmG