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Questions related from Robert Trevethan
When statistics packages (e.g., SPSS) are used to obtain intraclass correlation coefficients (ICCs), they provide the results of an F test. In my experience, the F value in these tests is almost...
31 August 2023 1,963 15 View
I am working with two sets of colleagues on research in which we have conducted multiple regression analyses. In one project, there are two independent variables (IVs), one of which is...
24 October 2021 9,864 10 View
When researchers create wealth indexes, it seems that standard practice involves using a varimax rotation of the data within a series of principal component analyses. This seems anomalous because...
27 August 2021 271 9 View
Recently, I have come across some advice that, when conducting principal components analysis (PCA), researchers should check the anti-image correlations and that if any items have an anti-image...
21 August 2021 5,005 15 View
As a result of exploratory factor analysis in some research about anxiety experienced by students when they study a foreign language, we have identified four distinct domains within which the...
15 June 2021 8,419 13 View
Recently, I have been exposed to data that prior research suggested would have a particular factor structure. When conducting confirmatory factor analysis (CFA) with those data, model fit has...
03 November 2020 9,605 14 View
A colleague and I are working with a scale that, according to EFA, clearly has 20 items and only two factors (10 items per factor - with nice high loadings; the items' extracted communalities are...
25 October 2020 1,928 5 View
When SPSS produces output associated with exploratory factor analyses (EFAs), that output usually includes parallel lists of communalities, the first list for initial communalities and the second...
04 October 2020 8,590 8 View
The correlations obtained at the end of an EFA in which an oblique rotation was used are different from the correlations that are obtained when the items from each factor are subsequently used to...
29 February 2020 9,230 6 View
We are conducting exploratory factor analysis in SPSS (maximum likelihood extraction, oblimin rotation), and sometimes both initial and extraction communalities are produced in the output, but not...
14 October 2019 9,916 15 View
From somewhere in my educational background, I absorbed the notion that data should ideally be normally distributed. However, I am increasingly coming to the view that this perception is...
29 June 2019 3,923 12 View
I am wondering which of two perspectives about convergent and discriminant validity are in accord with the notion of a nomological network proposed by Cronbach and Meehl (1955). According to one...
01 January 1970 5,960 8 View
