tephra

<p>These data record the percentages of aluminium oxide found in samples
from a tephra layer resulting from a volcanic eruption in Iceland
around 3500 years ago.</p>
<p>The variables are:</p><table class="table">
<tr><td><code>Al2O3</code></td><td>percentage of aluminium oxide</td></tr>
</table><p></p><p>
</p><p>The data were collected by A.Dugmore.  The geological background to the data is given by Dugmore et al (1992), Geochemical stability of finegrained silicic tephra in Iceland and Scotland, J.Quatern.Sci. 7, 173-83.</p>

regression

smooth

This is software linked to the book
'Applied Smoothing Techniques for Data Analysis -
The Kernel Approach with S-Plus Illustrations' Oxford University Press.

Adrian Bowman

Smoothing Methods for Nonparametric Regression and Density
Estimation

tephra function

<p>These data record the percentages of aluminium oxide found in samples
from a tephra layer resulting from a volcanic eruption in Iceland
around 3500 years ago.</p>
<p>The variables are:</p><table class='table'>
<tr><td><code>Al2O3</code></td><td>percentage of aluminium oxide</td></tr>
</table>


<p>The data were collected by A.Dugmore.  The geological background to the data is given by Dugmore et al (1992), Geochemical stability of finegrained silicic tephra in Iceland and Scotland, J.Quatern.Sci. 7, 173-83.</p>

tephra: Tephra layer

Description

Arguments