Conversation so far:
What is the relation between Raymond and Factor analysis?
In the 1920s, Cattell worked with Charles Spearman who was developing the new statistical technique of factor analysis in his effort.
What is the purpose of the effort applied?
Factor analysis became a powerful tool to help uncover the basic dimensions underlying a confusing array of surface variables within a particular domain.
How do they come about with the factor analysis?
Factor analysis was built upon the earlier development of the correlation coefficient, which provides a numerical estimate of the degree to which variables are "co-related".
What is the meaning of correlated variables?
For example, if "frequency of exercise" and "blood pressure level" were measured on a large group of people, then intercorrelating these two variables would provide.
What will it provide?
then intercorrelating these two variables would provide a quantitative estimate of the degree to which "exercise" and "blood pressure" are directly related to each other.
What other information do we have on the functionality of Factor analysis?
Factor analysis was built upon the earlier development of the correlation coefficient, which provides a numerical estimate of the degree to which variables.
What is the value of the variables?
the variables within a particular domain (such as cognitive ability or personality trait constructs) to determine the basic, unitary factors.

Question: What are the purpose of the unitary factors?
Self-contained rewrite: What are the variables within a particular domain (such as cognitive ability or personality trait constructs) to determine the basic, unitary factors?