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return false;"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z"/></svg> </a></li></ul><div class="topnav-buttons"> <a href="#" data-toggle="modal" data-target="#lc-subscription" class="btn-desktop-only pulse-button v5 topnav-btn"> <span class="button-inner"> XP² Newsletter </span> </a> <a href="/newsletter/" class="pulse-button v5 topnav-btn btn-mobile-only"> <span class="button-inner"> XP² Newsletter </span> </a></div></div></div><div class="lc-progress-wrap"><div class="lc-scroll-progress"></div></div></header><article id="post-22926" class="et_pb_post post-22926 article type-article status-publish has-post-thumbnail hentry article-category-testing-optimization article-industry-agnostic article-tags-customer-experience-management article-function-bi-analytics article-function-conversion-optimization article-function-marketing article-function-product-management article-type-tactical-guides"><div class="article-content"><div class="article-head-content-inner"><div class="article-breadcrumbs"> <a href="https://www.dynamicyield.com/articles/" title="Articles">Articles</a> <a href="https://www.dynamicyield.com/articles/category/testing-optimization/ ">A/B Testing & Optimization</a></div><h1 class="article-title">Introducing our Bayesian A/B Testing Calculators</h1><h2 class="article-excerpt">We’re excited to announce the official release of two free and useful tools. Our Bayesian A/B Testing Calculator and Test Duration/Sample Size Calculator.</h2><div class="article-authors lc-flex"><div class="article-author-box lc-col lc-flex"><div class="article-author-image lc-col"><div class="entry_author_image"><img src="https://www.dynamicyield.com/wp-content/authors/yaniv-127.jpg" alt="Yaniv Navot" width="76" height="76" /></div></div><div class="article-author-title lc-col"><div class="article-author-name"> <a href="https://www.dynamicyield.com/blog/author/yaniv/" title="Posts by Yaniv Navot" rel="author">Yaniv Navot</a></div><div class="article-author-title-text"> CMO, Dynamic Yield</div></div></div></div></div><div class="entry-content article-entry-content"><div class="article-entry-content-inner"><p>A while back, <a href="https://www.dynamicyield.com/blog/bayesian-testing/">we explored</a> a less restrictive and more reliable approach to <a href="https://www.dynamicyield.com/lesson/introduction-to-ab-testing/">A/B testing</a> in the form of a newer, Bayesian testing method.</p><p>With its simplicity, reliability, and intuitiveness, the Bayesian framework is a superior A/B testing methodology which will provide marketers a quicker and more robust statistical engine.</p><p>Therefore, we’ve been working long and hard to make it easier for marketers and <a href="https://marketing.dynamicyield.com/benchmarks/conversion-rate/">conversion rate</a> optimizers to utilize this new approach. And for us, that’s meant taking the complex math out of the equation.</p><p>So, today, we’re excited to announce the official release of two free and useful tools…</p><h2>Bayesian A/B Testing Calculator</h2><p><strong>Our<a href="https://marketing.dynamicyield.com/bayesian-calculator/"> Bayesian-powered A/B testing calculator</a></strong> will help you find out if your test results are statistically significant.</p><p>For each variation you test, all you have to do is input the total sample size and number of conversions. Then, based on statistical significance, the statistical engine will declare a winning variation.</p><p><span style="text-decoration: underline;">Here’s a quick breakdown of the terms and metrics we run</span>:</p><ul><li><strong>Sample Size</strong> – The number of users, sessions, or impressions depending on your KPI.</li><li><strong>Conversion</strong> – The number of clicks, even purchases or goal completions (e.g. purchases or video views).</li><li><strong>Conversion Rate</strong> – The number of completed actions (i.e. conversions) divided by the sample size.</li><li><strong>Probability to be Best</strong> – Each variation’s long-term probability to outperform all other live variations (given collected data since the creation or change of any variation included in the test).</li><li><strong>Expected Loss</strong> – The percent you are expected to lose in the long term if you declare the wrong variation as a winner versus the variation which is actually the best.</li><li><strong>Posterior Simulation of Difference</strong> – The distribution of conversion rates given the sample size collected so far.</li></ul><p><img decoding="async" style="border: 1px solid #eee; box-shadow: 1px 1px 4px #eee;" src="https://www.dynamicyield.com/wp-content/uploads/2017/07/b638f9f7-b7df-43bc-bb6e-4b46b506814d_ScreenShot2017-07-20at1.47.10PM.png" alt="Bayesian-powered A/B testing calculator" /></p><div style="border: 3px solid #51deb7; margin: 30px auto 40px auto; padding: 10px; text-align: center; text-transform: uppercase; max-width: 280px; width: 100%;"><strong><a class="underlinelink" href="https://marketing.dynamicyield.com/bayesian-calculator/">Access the calculator →</a></strong><br /> <em><span style="font-size: 12px; color: gray;">No login or registration necessary</span></em></div><p>To better understand your results, consider the winning variation above. Across the board, Variation A dominates in terms of conversion, conversion rate, Probability to Be The Best, as well as Expected Loss. Remember, the higher the PTBB and lower the EL, the better. This indicates confidence in long-term performance as well as lower expected loss if the variation declared a winner ends up being wrong (which it doesn’t look like it will be).</p><p>Learn more about <a href="https://www.dynamicyield.com/blog/statistical-significance/">the importance of statistical significance in A/B tests</a>.</p><h2>Bayesian A/B Test Duration & Sample Size Calculator</h2><p>Not sure how long you will have to run your experiments in order to get statistically significant results?</p><p>No worries. As the first of its kind, our free online <strong><a href="https://marketing.dynamicyield.com/ab-test-duration-calculator/">Bayesian-powered A/B test duration</a> and sample size calculator </strong>will help you avoid false positives and increase the validity of your A/B testing. There’s no hard limit on how many variations you can test against the control and we offer a few suggestions for how to approach your testing.</p><p>The calculated output provides range estimations of the time required to run the test in order to get statistically significant results, and the minimum required sample size to support that. While we know there are many other variables involved, these calculated estimations can be used for planning experiments in advance, as well as for analyzing ongoing tests.</p><p>Here’s a quick breakdown of the terms and metrics we run:</p><ul><li><strong>Baseline conversion rate</strong> – The current conversion rate (number of successful actions divided by the number of visitors, sessions, or impressions) for the experience you’re testing.</li><li><strong>Expected uplift in conversion rate</strong> – The X% change in conversion rate you are aiming for from your baseline rate. In the example below, if the baseline conversion rate is 2.5%, a 5% expected uplift would result in a new conversion rate of 2.625%.</li><li><strong>Number of variations</strong> – The number of variations compared in a single test.</li><li><strong>Average sample size per day</strong> – The number of visitors to be served in the experiment over the course of one day.</li></ul><p><img decoding="async" style="border: 1px solid #eee; box-shadow: 1px 1px 4px #eee;" src="https://www.dynamicyield.com/wp-content/uploads/2017/07/e8614395-4a61-4fed-b4f4-7cb97c335399_ScreenShot2017-07-20at1.53.56PM.png" alt="Bayesian-powered A/B test duration and sample size calculator" /></p><div style="border: 3px solid #51deb7; margin: 30px auto 40px auto; padding: 10px; text-align: center; text-transform: uppercase; max-width: 280px; width: 100%;"><strong><a class="underlinelink" href="https://marketing.dynamicyield.com/ab-test-duration-calculator/">Access the calculator →</a></strong><br /> <em><span style="font-size: 12px; color: gray;">No login or registration necessary</span></em></div><p>Now that you have everything you need to get started, we know you’ll be deploying Bayesian A/B tests at higher confidence intervals. And with a higher degree of self-confidence.</p><p>It’s important to note that while these tools support binary objectives (user converted or not) when measuring conversion, the real statistical engine behind the Dynamic Yield platform behaves differently, and supports more advanced, non-binary calculations, such as maximizing completions number, or revenue. To learn more about our statistical engine and automated optimization approach, <a href="https://www.dynamicyield.com/request-demo/">request a product demo</a>.</p><div class="article-separator"><svg width="54" height="26" viewBox="0 0 54 26" fill="none" xmlns="http://www.w3.org/2000/svg"> <path d="M53.0088 25.6367C52.7884 21.9564 51.8025 18.3625 50.1141 15.0849C48.4256 11.8073 46.0718 8.9181 43.2031 6.60203L43.2031 25.6367L53.0088 25.6367Z" fill="black"/> <path d="M14.4395 3.59038C10.3237 5.69174 6.82743 8.83082 4.29638 12.6973C1.76533 16.5638 0.28711 21.0239 0.0078125 25.6367L14.4395 25.6367L14.4395 3.59038Z" fill="black"/> <path d="M17.6563 2.20809L17.6562 25.6367L39.9829 25.6367L39.9829 4.36701C39.9829 4.36701 30.7303 -2.31342 17.6563 2.20809Z" fill="black"/> </svg></div><div class="article-tags-block"> <strong>Tags:</strong> <a href="https://www.dynamicyield.com/tags/customer-experience-management/">Customer Experience Management</a></div></div><div class="article-content-sidebar"><div class="article-content-sidebar-inner"><h4>Read next</h4><ul class="article-sidebar-nav"></ul></div></div></div></div></article></div></div><section class="lc-subscription-section"><div class="lc-subscription-form-block lc-subscription-inner"><h4 class="lc-subscription-title">Sign up for the XP² newsletter</h4><div class="lc-subscription-text">Join thousands of readers from Target, Citi, Spotify, Hulu, Google, Sephora, and other innovative brands who read our bi-weekly XP² newsletter, delivering educational content, research, and insights straight to your inbox</div><form class="mktoForm" data-formId="3876" data-formInstance="sub-inline"></form><div class="lc-privacy-wrapper"><div class="lc-privacy"> You may unsubscribe at any time. 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