www.w3.org/1998/Math/MathML"><semantics><msup><mi></mi><mn>1</mn></msup><annotation encoding="application/x-tex">^1</annotation></semantics></math></a>. Luckily in recent years others have started to develop R-based tools with graphical user interface and similar (and more) statistical functionality:</p>
<ul>
<li>
<a href="https://CRAN.R-project.org/package=gsDesign" class="external-link">gsDesign</a> with a free <a href="https://gsdesign.shinyapps.io/prod/" class="external-link">shiny web interface</a> inc