# A/B Testing Statistics

A/B testing statistics refers to the statistical model used in the conduction of an A/B test.

## What are A/B Testing Statistics

A/B testing statistics refers to the statistical model used in the conduction of an A/B test (controlled experiment) which in the App stores is the comparison in performance between two variations of an App store page. An A/B test will be used to approve or disprove a hypothesis by testing just a sample of the entire population in the live store, before using the observations collected to predict with a reasonable level of accuracy how the entire population in the live App stores will behave.

Every statistical model has a number of pre-requisites (test parameters) that need to be met in order to conduct a reliable test that shows which iteration performs better.

There are three A/B testing statistical methods that can be used in different ways. The first is the ‘frequentist’ approach which ignores any previous findings or knowledge from similar tests, using only data from the current experiment. ‘Sequential’ testing doesn’t limit sample size so the data is evaluated as it’s collected and testing can be stopped once enough data is collected. The third is the ‘Bayesian’ method of testing, used by third-party A/B testing platforms like Storemaven. This method works on the statistical theory that it’s possible to calculate the conversion rate probability of a variation based on having a model that constantly evolves and is taking into consideration the incoming data throughout the test. This results in a more accurate model that allows you to reach a conclusion with a high degree of certainty.

## Why A/B Testing Statistics are Important

Statistics is vital to the process of planning, running and evaluating A/B tests.

Simply put: failing to use the right statistical model when A/B testing would be a waste of time and money. The effective implementation of A/B testing statistics should translate to an increase in installs for the tested audience once the better performing page is applied to the entire population in the live App stores.

## A/B Testing Statistics and ASO

ASO teams need to be aware of any statistical model being used in A/B testing to ensure that it’s one that can be trusted to best serve the purpose of the test. It must produce results that can be implemented with confidence in the real App Store or Google Play Store and provide tangible benefits. Using the wrong statistical method that isn’t suited to the metrics being measured could result in having to endure the frustrating process of running tests, implementing results but without gaining any usable results initially hoped for.

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### Related Terms

• Mobile Growth
Mobile growth is the science of growing and gaining ground in reaching and retaining users in the App Store or Google Play.
• App Store Web Referral
App Store web referral is a traffic source which includes all visitors that arrive at an app listing from an external source (mobile web), most commonly the iOS Safari browser.