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# Basic concepts in factor analysis - Factor Analysis And Conjoint Analysis

Posted On :  27.05.2018 08:50 pm

The following are the key concepts on which factor analysis is based.

Basic concepts in factor analysis

The following are the key concepts on which factor analysis is based.

## Factor:

A factor plays a fundamental role among a set of attributes or variables. These variables can be filtered down to the factor. A factor represents the combined effect of a set of attributes. Either there may be one such factor or several such factors in a real life problem based on the complexity of the situation and the number of variables operating.

A factor loading is a value that explains how closely the variables are related to the factor. It is the correlation between the factor and the variable. While interpreting a factor, the absolute value of the factor is taken into account.

## Communality:

It is a measure of how much each variable is accounted for by the underlying factors together. It is the sum of the squares of the loadings of the variable on the common factors. If A,B,C,… are the factors, then the communality of a variable is computed using the relation

## Eigen value:

The sum of the squared values of factor loadings pertaining to a factor is called an eigen value. It is a measure of the relative importance of each factor under consideration.

## Total Sum Of Squares (TSS)

It is the sum of the eigen values of all the factors.

Tags : Research Methodology - Factor Analysis And Conjoint Analysis
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