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dr. M.S. (Matthijs) Berends
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@ -49,7 +49,7 @@
<meta property="og:description" content="g.test performs chi-squared contingency table tests and goodness-of-fit tests, just like chisq.test but is more reliable [1]. A G-test can be used to see whether the number of observations in each category fits a theoretical expectation (called a G-test of goodness-of-fit), or to see whether the proportions of one variable are different for different values of the other variable (called a G-test of independence)." />
<meta property="og:image" content="https://msberends.gitlab.io/logo.png" />
<meta property="og:image" content="https://msberends.gitlab.io/AMR/logo.png" />
<meta name="twitter:card" content="summary" />
@ -80,7 +80,7 @@
</button>
<span class="navbar-brand">
<a class="navbar-link" href="../index.html">AMR (for R)</a>
<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.5.0.9008</span>
<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.5.0.9009</span>
</span>
</div>
@ -93,12 +93,65 @@
Home
</a>
</li>
<li>
<a href="../articles/AMR.html">
<span class="fa fa-directions"></span>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
<span class="fa fa-question-circle"></span>
Get Started
How to
<span class="caret"></span>
</a>
<ul class="dropdown-menu" role="menu">
<li>
<a href="../articles/AMR.html">
<span class="fa fa-directions"></span>
Conduct AMR analysis
</a>
</li>
<li>
<a href="../articles/Predict.html">
<span class="fa fa-dice"></span>
Predict antimicrobial resistance
</a>
</li>
<li>
<a href="../articles/EUCAST.html">
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Apply EUCAST rules
</a>
</li>
<li>
<a href="../articles/mo_property.html">
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Get properties of a microorganism
</a>
</li>
<li>
<a href="../articles/ab_property.html">
<span class="fa fa-capsules"></span>
Get properties of an antibiotic
</a>
</li>
<li>
<a href="../articles/freq.html">
<span class="fa fa-sort-amount-down"></span>
Create frequency tables
</a>
</li>
<li>
<a href="../articles/G_test.html">
<span class="fa fa-clipboard-check"></span>
Use the G-test
</a>
</li>
</ul>
</li>
<li>
<a href="../reference/">
@ -121,17 +174,17 @@
Changelog
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<a href="https://gitlab.com/msberends/AMR">
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Source Code
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<a href="../LICENSE-text.html">
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@ -260,6 +313,12 @@
<p>where <code>df</code> are the degrees of freedom.</p>
<p>If there are more than two categories and you want to find out which ones are significantly different from their null expectation, you can use the same method of testing each category vs. the sum of all categories, with the Bonferroni correction. You use <em>G</em>-tests for each category, of course.</p>
<h2 class="hasAnchor" id="read-more-on-our-website-"><a class="anchor" href="#read-more-on-our-website-"></a>Read more on our website!</h2>
<p><img src='figures/logo.png' height=40px style=margin-bottom:5px /> <br />
On our website <a href='https://msberends.gitlab.io/AMR'>https://msberends.gitlab.io/AMR</a> you can find <a href='https://msberends.gitlab.io/AMR/articles/AMR.html'>a omprehensive tutorial</a> about how to conduct AMR analysis and find <a href='https://msberends.gitlab.io/AMR/reference'>the complete documentation of all functions</a>, which reads a lot easier than in R.</p>
<h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
<p>[1] McDonald, J.H. 2014. <strong>Handbook of Biological Statistics (3rd ed.)</strong>. Sparky House Publishing, Baltimore, Maryland. <a href='http://www.biostathandbook.com/gtestgof.html'>http://www.biostathandbook.com/gtestgof.html</a>.</p>
@ -270,7 +329,8 @@
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'><span class='co'># = EXAMPLE 1 =</span>
<pre class="examples"><span class='co'># NOT RUN {</span>
<span class='co'># = EXAMPLE 1 =</span>
<span class='co'># Shivrain et al. (2006) crossed clearfield rice (which are resistant</span>
<span class='co'># to the herbicide imazethapyr) with red rice (which are susceptible to</span>
<span class='co'># imazethapyr). They then crossed the hybrid offspring and examined the</span>
@ -279,7 +339,7 @@
<span class='co'># by a single gene with two co-dominant alleles, you would expect a 1:2:1</span>
<span class='co'># ratio.</span>
<span class='no'>x</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>772</span>, <span class='fl'>1611</span>, <span class='fl'>737</span>)<span class='co'>#'</span>
<span class='no'>x</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>772</span>, <span class='fl'>1611</span>, <span class='fl'>737</span>)
<span class='no'>G</span> <span class='kw'>&lt;-</span> <span class='fu'>g.test</span>(<span class='no'>x</span>, <span class='kw'>p</span> <span class='kw'>=</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>1</span>, <span class='fl'>2</span>, <span class='fl'>1</span>) / <span class='fl'>4</span>)
<span class='co'># G$p.value = 0.12574.</span>
@ -296,17 +356,13 @@
<span class='co'># observed 1752 right-billed and 1895 left-billed crossbills.</span>
<span class='no'>x</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>1752</span>, <span class='fl'>1895</span>)
<span class='fu'>g.test</span>(<span class='no'>x</span>)</div><div class='output co'>#&gt;
#&gt; G-test of goodness-of-fit (likelihood ratio test)
#&gt;
#&gt; data: x
#&gt; X-squared = 5.6085, df = 1, p-value = 0.01787
#&gt; </div><div class='input'># p = 0.01787343
<span class='fu'>g.test</span>(<span class='no'>x</span>)
<span class='co'># p = 0.01787343</span>
# There is a significant difference from a 1:1 ratio.
# Meaning: there are significantly more left-billed birds.
<span class='co'># There is a significant difference from a 1:1 ratio.</span>
<span class='co'># Meaning: there are significantly more left-billed birds.</span>
</div></pre>
<span class='co'># }</span></pre>
</div>
<div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
<h2>Contents</h2>
@ -325,6 +381,8 @@
<li><a href="#how-the-test-works">How the test works</a></li>
<li><a href="#read-more-on-our-website-">Read more on our website!</a></li>
<li><a href="#references">References</a></li>
<li><a href="#see-also">See also</a></li>