It is a statistical hypothesis testing for randomized experiment with twovariables A and B. The objective of A/B Testing is to detect any changes tothe web page to maximize or increase the outcome of an interest.

Some drawbacks of the linear model are:

• The assumption of linearity of the errors
• It can’t be used for count outcomes, binary outcomes
• There are overfitting problems that it can’t solve

It is a theorem that describes the result of performing the same experiment alarge number of times. This theorem forms the basis of frequency-stylethinking. It says that the sample mean, the sample variance and the samplestandard deviation converge to what they are trying to estimate.

These are extraneous variables in a statistical model that correlate directly orinversely with both the dependent and the independent variable. The estimatefails to account for the confounding factor.

It is a traditional database schema with a central table. Satellite tables mapID’s to physical name or description and can be connected to the central facttable using the ID fields; these tables are known as lookup tables, and areprincipally useful in real-time applications, as they save a lot of memory.Sometimes star schemas involve several layers of summarization to recoverinformation faster.