# Associations Analysis

The analysis of the beer and diapers is famous as a success of
data mining
.
Associations analysis is a method of this case.

Associations analysis is also called "Market-basket analysis".

##
Use

Associations analysis tells us the combination of things occurring frequently.

The combination is, for example, the probability that "If A occurs, B occurs"
and the probability that "If B occurs, A occurs".

It is interesting that both probabilities are not always same.
For example, "A is a bed and B is a sheet."

Complicated probability is also calculated.
For example, "if A and B occur, C occur."

##
Similarity to Other Methods

###
Rough Sets Analysis

When one variable is considered as Y and output about the variable is collected,
such analysis is similar to
Rough sets analysis
(RSA).

RSA studies the difference of the effect of the category of Y.
It is a difference between RSA and Associations analysis.

###
Bayesian Network

Associations analysis is a study of cause and effect.

Generally an effect is a cause of other effects.
Or causes of an effect are not always one.
Bayesian network
is a method to study such structure.

NEXT Correlation analysis of individual categories