This paper illustrates the surplus value of multilevel exploratory factor analysis in
educational effectiveness research. Educational researchers often use measures for
process variables at the class or school level to explain differences in student
outcomes. Recently, van de Vijver and Poortinga (2002) have developed a
procedure for multilevel exploratory factor analysis which can be extremely useful
in this kind of application. Their procedure, which is based on the ‘‘multilevel
confirmatory factor analysis’’ framework of Muthe´n (1994), is demonstrated by
means of constructing measures for school process variables based on teacher
data. Every step of the procedure is nicely illustrated and commented on using
these data. Furthermore, the meaning of the findings and challenges when using
multilevel exploratory factor analysis are emphasized.
Keywords: multilevel exploratory factor analysis; school process variables;
educational effectiveness research