btb {nlrwr}R Documentation

Bond lengths

Description

Bond lengths for asymmetric atomic bromine-tellurium-bromine triples.

Usage

data(btb)

Format

A data frame with 17 observations on the following 2 variables.

x
a numeric vector of shorter bond lengths
y
a numeric vector of longer bond lengths

Details

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.

Source

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.


[Package nlrwr version 1.0-6 Index]