-<p>The goal of Rnaught is to provide a a collection of methods for
+<p>The goal of Rnaught is to provide a collection of methods for
estimating the <a href="https://en.wikipedia.org/wiki/Basic_reproduction_number" class="external-link">basic
reproduction number</a>
(<math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msub><mi>R</mi><mn>0</mn></msub><annotation encoding="application/x-tex">R_0</annotation></semantics></math>)