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Hi, I use nls to fit Gaussian curves to datasets that are expected to be Gaussian-shaped: gauss.fit = nls(y ~ amp*exp(-0.5*(x-x0)^2/theVariance^2) + theNoise, data = smooth, start = gauss.fit.start) Some of these datasets are indeed shaped like Gaussians, while others are not. I would like to use a goodness of fit metric to assess whether a Gaussian curve is a good fit to the data. I wonder what metric would be appropriate for this purpose. I saw some discussions on this list that suggested that R^2 is not meaningful in the non-linear regression context, and that is why it's not reported in the nls _object_. Are there other, more appropriate goodness of fit measures? Thanks. Yury [[alternative HTML version deleted]] ______________________________________________ This e-mail address is being protected from spam bots, you need JavaScript enabled to view it mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.

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fit goodness of fit metrics for non-linear models

Yury V. Bukhman

2009/04/03 17:45

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Protect your skin

When is getting cold, we assume warmer sweater, we warm with the raspberry tea ... And what about our skin? Help and care for her condition in autumn and winter. Methods of skin care products need to adapt not only to our age, as well as to changes of season. If you don't care about protection cosmetics after summer or winter, you need to change that. Each season is ruled by its laws. It is clear that in winter we use other cosmetics than in spring, summer or autumn. With each season, some other skin care needs.

Atmospheric factors, such as cold air, gusty wind, snow and low temperatures are extremely detrimental to our skin. The skin of hands and face is the most exposed to the autumn and winter of irritation, such as the frostbites that cause drying of the skin. The decrease of temperature reduces production of tallow, a cold wind makes it less blooded, which negatively affects its metabolism. The result is dehydration of skin, the resulting increase in sensitivity, and sometimes even flaccidity.

Fortunately, thanks to appropriate care, this problem can be remedied. Not only the outdoors are waiting for us of danger, the form of the skin also affects the hot air in the premises. How do I fix this? Help a few tips.

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