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Factor analysis and its assumptions

What is factor analysis statistical method, its test assumptions, and when is this test appropriate to use? How many independent and dependent variables are generally involved?

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What is factor analysis statistical method?
Factor analysis is a statistical method used to investigate whether a number of variables of interest are linearly related to a smaller number of unobserved variables.It is a data reduction tool which removes repetition from a set of correlated variables. The core objective of factor analysis is to reduce the number of variables used to explain a relationship. ...

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This solution discusses factor analysis and its assumptions.

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