ex1317

About 65 million years ago, the dinosaurs suffered a mass extinction
 virtually overnight (in geologic time). Among many clues, one that
 all scientists regard as crucial is a layer of iridium-rich dust that
 was deposited over much of the earth at that time. The theory is that
 an event like a volcanic eruption or meteor impact caused a massive
 dust cloud that blanketed the earth for years killing off animals and
 their food sources. Dataset has Iridium depths by type of deposit.

datasets

Data sets from Ramsey, F.L. and Schafer, D.W. (2002), "The
Statistical Sleuth: A Course in Methods of Data Analysis (2nd
ed)", Duxbury.

Berwin Turlach

Sleuth2

Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd
Ed)"

ex1317 function

A data frame with 28 observations on the following 3 variables.<dl>
 <dt><code>Iridium</code></dt>
<dd>Iridium in samples (ppt)</dd> <dt><code>Strata</code></dt>
<dd>a factor with levels <code>"Limestone"</code> and
 <code>"Shale"</code></dd> <dt><code>Depth</code></dt>
<dd>a factor with six levels: <code>"1"</code>, <code>"2"</code>,
 ..., <code>"6"</code></dd> 
</dl>

Format

Dinosaur Extinctions---An Observational Study — ex1317

A data frame with 28 observations on the following 3 variables.<dl>
 <dt><code>Iridium</code></dt>
<dd>Iridium in samples (ppt)</dd>

 <dt><code>Strata</code></dt>
<dd>a factor with levels <code>"Limestone"</code> and
 <code>"Shale"</code></dd>

 <dt><code>Depth</code></dt>
<dd>a factor with six levels: <code>"1"</code>, <code>"2"</code>,
 ..., <code>"6"</code></dd>

 
</dl>

ex1317: Dinosaur Extinctions---An Observational Study

Description

Usage

Arguments

Format

References

Examples