anneal.df {dafs}

Annealing float glass

Description

Rushton was interested in the effect of annealing on the refractive index of glass. It is well known that annealing float glass changes the refractive index (RI). The change in RI - called delta-RI - can tell a forensic scientist something about the glass that they are examining.

In this data set, 3 replicate measurements were made from 150 squares of glass from a single pane. Each fragment was measured pre and post annealing.

Usage

data(anneal.df)

Format

A data frame with 900 observations on 3 variables.

[,1]	ri	numeric	The fragment's refractive index
[,2]	temp	numeric	The fragment's match temperature - this will be almost perfectly correlated with ri
[,3]	anneal	factor	either pre or post for pre or post annealing

Author(s)

K.P. Rushton

References

Rushton, K.P., Analysis of the variation of glass refractive index with respect to annealing, (2009) MSc Thesis, Forensic Science, University of Auckland.