How many variables are necessary to reflect one construct? What are the maximum number of variables limitation for EFA, CFA analysis?

03 March 2016 1 5K Report

There is no unique answer to your question. In general, 3 to 7 variables are considered appropriate. However, to interpret EFA, at least 3 variables per factor with significance are required. In other words, to dub something as a "factor" 3 variables are required. A factor with 2 variables is only considered reliable when the

variables are highly correlated with each another (r > .70) but fairly uncorrelated with other variables. EFA and CFA are data reduction techniques so asking for the maximum number of variables is I think irrelevant.

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