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authorJohannes Ranke <jranke@uni-bremen.de>2018-03-01 10:35:09 +0100
committerJohannes Ranke <jranke@uni-bremen.de>2018-03-01 10:35:09 +0100
commit966da79af48c371c05dd8011702ef2bd3b1d1e03 (patch)
treef14a97f3d7ee962031af9c41a4bbe5d7391a9f85 /docs/reference/lod.html
parentb7e28fd4357d7ba353be74ba5c53550fb54d3a8a (diff)
Static documentation rebuilt using current pkgdown
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@@ -18,19 +18,35 @@
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+
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+<meta property="og:title" content="Estimate a limit of detection (LOD) — lod" />
+<meta property="og:description" content="The decision limit (German: Nachweisgrenze) is defined as the signal or
+ analyte concentration that is significantly different from the blank signal
+ with a first order error alpha (one-sided significance test).
+ The detection limit, or more precise, the minimum detectable value
+ (German: Erfassungsgrenze), is then defined as the signal or analyte
+ concentration where the probability that the signal is not detected although
+ the analyte is present (type II or false negative error), is beta (also a
+ one-sided significance test)." />
+<meta name="twitter:card" content="summary" />
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@@ -83,45 +99,46 @@
one-sided significance test).</p>
- <pre>lod(object, &#8230;, alpha = 0.05, beta = 0.05, method = "default", tol = "default")</pre>
+ <pre class="usage">lod(object, &#8230;, alpha = 0.05, beta = 0.05, method = "default", tol = "default")</pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a> Arguments</h2>
- <dl class="dl-horizontal">
- <dt>object</dt>
- <dd>
- A univariate model object of class <code>lm</code> or
+ <table class="ref-arguments">
+ <colgroup><col class="name" /><col class="desc" /></colgroup>
+ <tr>
+ <th>object</th>
+ <td><p>A univariate model object of class <code>lm</code> or
<code><a href='http://www.rdocumentation.org/packages/MASS/topics/rlm'>rlm</a></code>
with model formula <code>y ~ x</code> or <code>y ~ x - 1</code>,
- optionally from a weighted regression.
- </dd>
- <dt>&#8230;</dt>
- <dd>
- Placeholder for further arguments that might be needed by
- future implementations.
- </dd>
- <dt>alpha</dt>
- <dd>
- The error tolerance for the decision limit (critical value).
- </dd>
- <dt>beta</dt>
- <dd>
- The error tolerance beta for the detection limit.
- </dd>
- <dt>method</dt>
- <dd>
- The &#8220;default&#8221; method uses a prediction interval at the LOD
+ optionally from a weighted regression.</p></td>
+ </tr>
+ <tr>
+ <th>&#8230;</th>
+ <td><p>Placeholder for further arguments that might be needed by
+ future implementations.</p></td>
+ </tr>
+ <tr>
+ <th>alpha</th>
+ <td><p>The error tolerance for the decision limit (critical value).</p></td>
+ </tr>
+ <tr>
+ <th>beta</th>
+ <td><p>The error tolerance beta for the detection limit.</p></td>
+ </tr>
+ <tr>
+ <th>method</th>
+ <td><p>The &#8220;default&#8221; method uses a prediction interval at the LOD
for the estimation of the LOD, which obviously requires
iteration. This is described for example in Massart, p. 432 ff.
The &#8220;din&#8221; method uses the prediction interval at
- x = 0 as an approximation.
- </dd>
- <dt>tol</dt>
- <dd>
- When the &#8220;default&#8221; method is used, the default tolerance
+ x = 0 as an approximation.</p></td>
+ </tr>
+ <tr>
+ <th>tol</th>
+ <td><p>When the &#8220;default&#8221; method is used, the default tolerance
for the LOD on the x scale is the value of the smallest non-zero standard
- divided by 1000. Can be set to a numeric value to override this.
- </dd>
- </dl>
+ divided by 1000. Can be set to a numeric value to override this.</p></td>
+ </tr>
+ </table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
@@ -143,16 +160,16 @@
<p>Massart, L.M, Vandenginste, B.G.M., Buydens, L.M.C., De Jong, S., Lewi, P.J.,
Smeyers-Verbeke, J. (1997) Handbook of Chemometrics and Qualimetrics: Part A,
Chapter 13.7.8</p>
- <p>J. Inczedy, T. Lengyel, and A.M. Ure (2002) International Union of Pure and
+<p>J. Inczedy, T. Lengyel, and A.M. Ure (2002) International Union of Pure and
Applied Chemistry Compendium of Analytical Nomenclature: Definitive Rules.
Web edition.</p>
- <p>Currie, L. A. (1997) Nomenclature in evaluation of analytical methods including
+<p>Currie, L. A. (1997) Nomenclature in evaluation of analytical methods including
detection and quantification capabilities (IUPAC Recommendations 1995).
Analytica Chimica Acta 391, 105 - 126.</p>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
- <p>Examples for <code><a href='din32645.html'>din32645</a></code></p>
+ <p>Examples for <code>din32645</code></p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
@@ -200,7 +217,7 @@
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- <p>Site built with <a href="http://hadley.github.io/pkgdown/">pkgdown</a>.</p>
+ <p>Site built with <a href="http://pkgdown.r-lib.org/">pkgdown</a>.</p>
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