Skagit.NH3_N.df

Ammonia nitrogen (NH\(_3\)---N) concentration (mg/L) in the Skagit River
 measured monthly from January 1978 through December 2010 at the
 Marblemount, Washington monitoring station.

datasets

Graphical and statistical analyses of environmental data, with
focus on analyzing chemical concentrations and physical parameters, usually in
the context of mandated environmental monitoring. Major environmental
statistical methods found in the literature and regulatory guidance documents,
with extensive help that explains what these methods do, how to use them,
and where to find them in the literature. Numerous built-in data sets from
regulatory guidance documents and environmental statistics literature. Includes
scripts reproducing analyses presented in the book "EnvStats: An R Package for
Environmental Statistics" (Millard, 2013, Springer, ISBN 978-1-4614-8455-4,
<https://www.springer.com/book/9781461484554>).

Alexander Kowarik

EnvStats

Package for Environmental Statistics, Including US EPA Guidance

Steven P. Millard

Skagit.NH3_N.df function

A data frame with 396 observations on the following 6 variables.<dl class="dl-horizontal">
 <dt><code>Date</code></dt><dd>Date of collection.</dd>
 <dt><code>NH3_N.Orig.mg.per.L</code></dt><dd>a character vector of the ammonia
 nitrogen concentrations where values for non-detects are preceeded
 with the less-than sign (&lt;).</dd>
 <dt><code>NH3_N.mg.per.L</code></dt><dd>a numeric vector of ammonia nitrogen
 concentrations; non-detects have been coded to their detection limit.</dd>
 <dt><code>DQ1</code></dt><dd>factor of data qualifier values.
 <ul>
<li><code>U</code> = The analyte was not detected at or above the reported result.</li>
<li><code>J</code> = The analyte was positively identified. The associated numerical result is an estimate.</li>
<li><code>UJ</code> = The analyte was not detected at or above the reported estimated result.</li>
</ul></dd>
 <dt><code>DQ2</code></dt><dd>factor of data qualifier values.
 An asterisk (<code>*</code>) indicates a possible quality problem for the result.</dd>
 <dt><code>Censored</code></dt><dd>a logical vector indicating which observations are censored.</dd>
 </dl>

Format

Ammonia Nitrogen Concentrations in the Skagit River, Marblemount, Washington — Skagit.NH3_N.df

A data frame with 396 observations on the following 6 variables.<dl class='dl-horizontal'>
 <dt><code>Date</code></dt><dd>Date of collection.</dd>
 <dt><code>NH3_N.Orig.mg.per.L</code></dt><dd>a character vector of the ammonia
 nitrogen concentrations where values for non-detects are preceeded
 with the less-than sign (&lt;).</dd>
 <dt><code>NH3_N.mg.per.L</code></dt><dd>a numeric vector of ammonia nitrogen
 concentrations; non-detects have been coded to their detection limit.</dd>
 <dt><code>DQ1</code></dt><dd>factor of data qualifier values.
 <ul>
<li><code>U</code> = The analyte was not detected at or above the reported result.</li>
<li><code>J</code> = The analyte was positively identified. The associated numerical result is an estimate.</li>
<li><code>UJ</code> = The analyte was not detected at or above the reported estimated result.</li>
</ul></dd>
 <dt><code>DQ2</code></dt><dd>factor of data qualifier values.
 An asterisk (<code>*</code>) indicates a possible quality problem for the result.</dd>
 <dt><code>Censored</code></dt><dd>a logical vector indicating which observations are censored.</dd>
 </dl>

Skagit.NH3_N.df: Ammonia Nitrogen Concentrations in the Skagit River, Marblemount, Washington

Description

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Arguments

Format

Details