sts {nlrwr} | R Documentation |
Bond lengths for asymmetric atomic sulphur-tellurium-sulphur triples.
data(sts)
A data frame with 26 observations on the following 2 variables.
x
y
The dataset is one out of two datasets containing measurements on asymmetric and symmetric atomic triples, respectively, from an experiment in structural chemistry.
A non-linear regression model with mean function
f(x) = a + frac{(b-a)^(c+1)}{(x-a)^c}
with parameters a,b,c (a translated generalised hyperbola model) appears to be appropriate.
Hamilton, D. C. and Knop, O (1998) Combining non-linear regressions that have unequal error variances and some parameters in common, Appl. Statist., 47, 173–185.