coalash

These data record the percentage of coal ash found in mining samples 
originally reported by Gomez and Hazen (1970) and subsequently used
by Cressie (1993).
The variables are:<table class="table">
<tr><td><code>East</code></td><td>a code for east-west direction</td></tr>
<tr><td><code>North</code></td><td>a code for north-south direction</td></tr>
<tr><td><code>Percent</code></td><td>the percentage of coalash</td></tr>
</table>
Cressie, N. (1993). Statistics for Spatial Data, revised edition. New York: Wiley. 
Gomez, M. and Hazen, K. (1970). Evaluating sulfur and ash distribution in coal seams by statistical response surface regression analysis. Report RI 7377, U.S. Bureau of Mines, Washington, D. C.

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

coalash function

These data record the percentage of coal ash found in mining samples 
originally reported by Gomez and Hazen (1970) and subsequently used
by Cressie (1993).
The variables are:<table class='table'>
<tr><td><code>East</code></td><td>a code for east-west direction</td></tr>
<tr><td><code>North</code></td><td>a code for north-south direction</td></tr>
<tr><td><code>Percent</code></td><td>the percentage of coalash</td></tr>
</table>


Cressie, N. (1993). Statistics for Spatial Data, revised edition. New York: Wiley. 
Gomez, M. and Hazen, K. (1970). Evaluating sulfur and ash distribution in coal seams by statistical response surface regression analysis. Report RI 7377, U.S. Bureau of Mines, Washington, D. C.

coalash: Coal ash in mining samples

Description

Arguments

`East`	a code for east-west direction
`North`	a code for north-south direction
`Percent`	the percentage of coalash