Statistics for A/B testing
Become a proper optimizer and know your stats. If you’re not fluent in A/B testing statistics, you won’t be able to tell whether your tests suck. A lot of your “winning” tests are probably not winners at all. Learn to call bullshit when needed, and be the person who advocates proper scientific approach in your team.
In this 8-class training program, you’ll learn:
- How to run A/B tests with a sound statistical design.
- How to ask the right questions, avoid common mistakes, and get insights through statistics.
- An in-depth understanding of statistical hypothesis testing and concepts like statistical significance, confidence intervals, statistical power, and others.
This course is right for you if…
- You can’t define statistical significance correctly without looking it up on Google.
- Your A/B tests produce a lot of “winners,” but your clients aren’t seeing improvements.
- You’re planning and analyzing A/B tests, but you don’t understand the statistical underpinnings of the testing process.
- You’re not confident in the outcomes of your tests and are unsure how much trust to put in them
- You have an in-house statistical tool you want to improve, or you use a third-party A/B testing software you want to understand better
This course is NOT for you if…
- You are just starting with CRO and have little to no practical experience with A/B testing.
- You don’t employ A/B tests as a primary method to evaluate CRO work.
- You are a professional statistician or experimental design specialist.
Skills you should have…
Some experience in conversion rate optimization.
Basic understanding of how A/B testing works.
Some experience with an A/B testing software.
This class will give you all the tools you need to understand the complexities involved in planning and evaluating A/B tests.
Aside from mining specific information, you’ll get deeper and more accurate insights from your data in the process.
Avoid costly testing mistakes stemming from misuse and misunderstanding of statistics, and improve the ROI of all your A/B testing efforts, with Georgi Georgiev’s guidance.
About your instructor:
Georgi Georgiev is the owner of WebFocus, a digital marketing consulting company delivering world-class marketing and analytics services for the past 10 years.
He’s the mastermind behind Analytics-Toolkit.com, a SaaS used by web analysts and CRO practitioners from agencies across the world.
Georgi is a lecturer in multiple marketing events, as well as a Google Regional Trainer in AdWords & Analytics. He is also the author of three papers and multiple articles on A/B testing for conversion rate optimization.
See what others have to say about this course:
Anyone interested in genuinely understanding the math behind CRO and A/B testing absolutely has to go through this course and take the exam as well. My whole team had a great time discussing the course material and aligning our views on the process we use and to come up with the ideas to implement in the future.
In just 8 sessions, you’ll be able to:
- Plan maximally efficient A/B tests.
- Correctly interpret A/B testing statistics.
- Navigate the complexities of MVT, segmentation, multiple KPIs, and concurrent tests.
- Plan and analyze sequential tests.
Statistics for A/B testing
Why A/B test? Basics of causal inference
In the first class, we’ll lay the groundwork that's required in order to understand more advanced concepts in subsequent classes. We’ll go over basic concepts that are crucial for developing a probabilistic mindset.
- Correlation and causation. Observational analysis versus controlled experiments.
- Sampling and natural variance and their implications for drawing insights from data.
- Null-hypothesis statistical tests – history and basics of causal inference.
- Control and randomization in A/B tests – why we need them and how they work?
- One-sided and two-sided tests, composite vs. point hypothesis.
Statistical significance & confidence intervals
Statistical significance is one of the most abused concepts in conversion rate optimization. You will learn what it is, really. We’ll discuss common misuses and misunderstandings, their consequences, and how to avoid them.
- What is statistical significance.
- Common misuses of statistical significance and how to avoid them.
- Common misinterpretations and how to avoid them.
- A/A, A/B/A, A/A/B/B testing – when are they appropriate, and what can they be used for?
- Confidence intervals.
Planning A/B tests: Sample size & statistical power
Why is statistical power so important, and yet so neglected? You will learn about the trade-offs involved in planning A/B tests, and how to avoid under- and over-powered tests.
- What is statistical power and why does it matter?
- The relationship between power and other statistical parameters: significance, sample size, & minimum detectable effect.
- Under-powered and over-powered tests.
Multivariate testing & concurrent tests
Learn how to properly plan and analyze a multivariate test, avoiding common pitfalls. We examine the practice of running multiple concurrent tests, and how and when it's appropriate.
- Complexities introduced by testing more than one variant versus control
- When is an A/B/n test preferred to a simple A/B test?
- Do’s and don’ts of running concurrent tests
Segmentation, multiple KPIs, & non-binomial tests
Learn how to gain deeper insights by segmentation. We’ll also examine the fine details of using multiple outcome metrics for a test and cover non-binomial metrics such as revenue per user.
- Segmenting A/B testing data for maximum insights.
- Complexities in running tests with more than one outcome metric.
- Analyzing non-binomial data such as revenue and time on site.
Sequential testing is the future of A/B testing. Learn about different approaches to sequential testing, and how to plan and analyze a sequential test.
- Shortcomings of classical fixed-sample tests
- The issue of optional stopping
- The alpha-spending approach to sequential testing
- Planning and analyzing a sequential test
- Adaptive tests – benefits and drawbacks
Faster testing by asking the right questions
How can we run A/B tests with maximum efficiency? By designing and analyzing them to reflect the questions we want answered.
- One vs two-tailed significance tests
- Non-inferiority testing
- Nontraditional hypothesis and analysis
Planning ROI-positive A/B tests
The cherry on top: how to combine everything from the past seven courses to run highly efficient A/B tests that result in great returns.
- Costs and benefits in A/B testing
- Planning ROI-positive A/B tests
Show Off Your New Skills: Get a Certificate of Completion
Once the course is over, pass a test to get certified in Statistics for A/B Testing
Add it to your resume, your LinkedIn profile or just get that well-earned raise you’ve been waiting for.
Need help getting your employer to pay for this program?
Enroll to CXL Institute now:
Some of the companies that train their teams here: