The same reasoning goes for questions 4, 5 and 6: if they really measure “the same thing” they'll probably correlate highly. Now, if questions 1, 2 and 3 all measure numeric IQ, then the Pearson correlations among these items should be substantial: respondents with high numeric IQ will typically score high on all 3 questions and reversely. For measuring these, we often try to write multiple questions that -at least partially- reflect such factors. Such “underlying factors” are often variables that are difficult to measure such as IQ, depression or extraversion. SPSS Factor Analysis – Beginners Tutorial By Ruben Geert van den Berg under Basics & Factor Analysisįactor analysis is a statistical technique for identifying which underlying factors are measured by a (much larger) number of observed variables.
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