# Technology – A Brief Overview of A/B Testing

A/B Testing, also known as a Comparison/ Covariance analysis is a methodology used to compare the performance of various models under different sets of assumptions. A/B testing involves a comparison between two models and normally, there will be two types of models: A and B. A/B testing involve a randomized, controlled experiment using two versions, A and B, under specified assumptions. The results will be statistically significant when one of the models is significantly different from the other model.

A test can be described as an estimate of the probability density function associated with a variable. The sample is the sample of points that have been drawn from a distribution. This distribution is known as the normal curve or normal distribution. The difference in values of the mean or deviation of the normal curve from the mean value is referred to as the criterion level for a test.

There are many reasons why a test can be performed. One reason is to identify differences between models that are significantly dissimilar from each other. Another reason is to detect changes over time that may affect the statistical properties of the data and models. Another reason is to explore relationships among variables, or relationships among observed data and expected values of a variable.

Data sets for A/B Testing must be properly analyzed and maintained. The test results will depend on the procedures followed for data collection and the types of tests performed.

Data analysis can be done manually or using a computer-automated Sensing/Observational Analysis. Manual analysis requires that measurements of the variables are taken at random. This requires knowledge of the variance component of the statistical model used to generate the data. Computer AISigs allow data to be analyzed without sampling. However, computer AISigs results can only be examined in specific models, such as logistic regression, polynomial tree models, and finite element modeling.

A/B Testing involves several steps to determine which models have the strongest effect on the data. A model is selected, then a significant other variable is chosen, and the associated data set is generated. From this data set, a hypothesis can be made about the probability of the chosen model. Then this significance level is compared to the actually observed data set. If it is found to be significantly different, a change in the statistical model is made, and a new data set is generated.

Significance levels for A/B Test can range from 0 to 1. For instance, a test is conducted on two groups, A and B, with one group being statistically significantly different from the other. If the significance level for A is three, there should also be a significant difference between the data sets for B and C. But if the significance level for A is two, there should be no significant differences between the data sets for B and C. A/B Test can be performed on a smaller or larger sample size than a traditional test. It is sometimes used as a threshold value for rejecting a significant result from a model.

A/B Test uses a weaker type of statistical test to determine whether the effect of the selected model on the data set is not significant after a significant number of tests. This type of test is called a non-parametric test. The data set for a non-parametric test is usually not very large, making it easier to analyze the non-parametric data set and determine the significance of the model selected on the basis of significance testing.