glass2

Glass Fragment Elemental Composition Data on 15 variables.

datasets

In forensics, it is common and effective practice to analyse glass fragments from the scene and suspects
to gain evidence of placing a suspect at the crime scene.
This kind of analysis involves comparing the physical and chemical attributes of glass fragments that exist on both the
person and at the crime scene, and assessing the significance in a likeness that they share.
The package implements the Scott-Knott Modification 2 algorithm (SKM2) (Christopher M. Triggs and
James M. Curran and John S. Buckleton and Kevan A.J. Walsh (1997) <doi:10.1016/S0379-0738(96)02037-3>
"The grouping problem in forensic glass analysis: a divisive approach", Forensic Science International, 85(1), 1--14)
for small sample glass fragment analysis using the refractive index (ri) of a set of glass samples.
It also includes an experimental multivariate analog to the Scott-Knott algorithm for similar analysis on glass samples
with multiple chemical concentration variables and multiple samples of the same item; testing against the Hotellings T^2
distribution (J.M. Curran and C.M. Triggs and J.R. Almirall and J.S. Buckleton and K.A.J. Walsh (1997)
<doi:10.1016/S1355-0306(97)72197-X> "The interpretation of elemental composition measurements from forensic
glass evidence", Science & Justice, 37(4), 241--244).

Toby Hayward

SK4FGA

Scott-Knott for Forensic Glass Analysis

James Curran

Lewis Kendall-Jones

glass2 function

a `data.frame` with 16 rows and 16 columns.<dl>
 <dt>item</dt>
<dd>factor</dd>
761 levels - which item the measurements came from
 <dt>Li7</dt>
<dd>numeric</dd>
log of lithium concentration
 <dt>Mg25</dt>
<dd>numeric</dd>
log of magnesium concentration
 <dt>Al27</dt>
<dd>numeric</dd>
log of aluminium concentration
 <dt>K39</dt>
<dd>numeric</dd>
log of potassium concentration
 <dt>Ti49</dt>
<dd>numeric</dd>
log of titanium concentration
 <dt>Mn55</dt>
<dd>numeric</dd>
log of manganese concentration
 <dt>Fe57</dt>
<dd>numeric</dd>
log of iron concentration
 <dt>Rb85</dt>
<dd>numeric</dd>
log of rubidium concentration
 <dt>Sr88</dt>
<dd>numeric</dd>
log of strontium concentration
 <dt>Zr90</dt>
<dd>numeric</dd>
log of zirconium concentration
 <dt>Ba137</dt>
<dd>numeric</dd>
log of barium concentration
 <dt>La139</dt>
<dd>numeric</dd>
log of lanthanum concentration
 <dt>Ce140</dt>
<dd>numeric</dd>
log of cerium concentration
 <dt>Nd146</dt>
<dd>numeric</dd>
log of neodymium concentration
 <dt>Pb208</dt>
<dd>numeric</dd>
log of lead concentration</dl>

Format

glass2 — glass2

a `data.frame` with 16 rows and 16 columns.<dl>
 <dt>item</dt>
<dd>factor</dd>
761 levels - which item the measurements came from
 <dt>Li7</dt>
<dd>numeric</dd>
log of lithium concentration
 <dt>Mg25</dt>
<dd>numeric</dd>
log of magnesium concentration
 <dt>Al27</dt>
<dd>numeric</dd>
log of aluminium concentration
 <dt>K39</dt>
<dd>numeric</dd>
log of potassium concentration
 <dt>Ti49</dt>
<dd>numeric</dd>
log of titanium concentration
 <dt>Mn55</dt>
<dd>numeric</dd>
log of manganese concentration
 <dt>Fe57</dt>
<dd>numeric</dd>
log of iron concentration
 <dt>Rb85</dt>
<dd>numeric</dd>
log of rubidium concentration
 <dt>Sr88</dt>
<dd>numeric</dd>
log of strontium concentration
 <dt>Zr90</dt>
<dd>numeric</dd>
log of zirconium concentration
 <dt>Ba137</dt>
<dd>numeric</dd>
log of barium concentration
 <dt>La139</dt>
<dd>numeric</dd>
log of lanthanum concentration
 <dt>Ce140</dt>
<dd>numeric</dd>
log of cerium concentration
 <dt>Nd146</dt>
<dd>numeric</dd>
log of neodymium concentration
 <dt>Pb208</dt>
<dd>numeric</dd>
log of lead concentration

</dl>

glass2: glass2

Description

Usage

Arguments

Format

Details

References