Dear Researchers and statistical analysts,
Which version of Mplus is suitable to assess the exploratory factor analysis (EFA) of a questionnaire with 20 items?
I'm working on initial validation of a 20-item scale to assess obsessive-compulsive symptoms related to COVID-19 in patients with obsessive-compulsive disorder (OCD). The scale is a dimensional scale meaning its first five items are the first dimension, its second five items are the second dimension, its third five items are the third dimension, and its fourth five items are the fourth dimension. This scale is similar to the Dimensional Obsessive–Compulsive Scale (DOCS; Abramowitz, J. S., Deacon, B. J., Olatunji, B. O., Wheaton, M. G., Berman, N. C., Losardo, D., ... & Björgvinsson, T. (2010). Assessment of obsessive-compulsive symptom dimensions: Development and evaluation of the Dimensional Obsessive-Compulsive Scale. Psychological assessment, 22(1), 180.) I expect to extract four factors. I run the following commands in Mplus VERSION 8.4 DEMO:
Title: EFA in Mplus;
Data: file is "c:\users\vahid\desktop\ocdss1.dat";
Variable: Names are
A1 A2 A3 A4 A5 A6 A7 B3 B4 B5 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5;
Usevariables are
A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5;
Analysis: Type is EFA 1 4;
Then this output appears:
Mplus VERSION 8.4 DEMO
MUTHEN & MUTHEN
INPUT INSTRUCTIONS
Title: EFA in Mplus;
Data: file is "c:\users\vahid\desktop\ocdss1.dat";
Variable: Names are
A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5;
Usevariables are
A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5;
Analysis: Type is EFA 1 4;
DEMO VERSION MAXIMUM EXCEEDED
Maximum number of dependent variables has been exceeded.
Number of dependent variables in the model: 20
Mplus VERSION 8.4 DEMO has the following limitations:
Maximum number of dependent variables: 6
Maximum number of independent variables: 2
Maximum number of between variables: 2
Maximum number of continuous latent variables in time series analysis: 2
Please help me
The latest version available can easily run the results you require
Dear Dr. Cristian Ramos-Vera ,
I have the latest version (i.e., Mplus VERSION 8.4 DEMO), but I did not run the results. If your suggested version is different from my used version, would you please give me the download link of your suggested version?
Regards,
Vahid
I want to validate a scale containing 20 items. I expect to extract four factors. I perform commands in Mplus ( Mplus VERSION 8.4 DEMO) as in the following:
Title: EFA in Mplus;
Data: file is C19-OCDSS1.dat;
Variable: names are
Q1-Q20;
Usevariable are
Q1-Q20;
Analysis: EFA 1 4;
Is my definition of the command of "Variable" as "names are Q1-Q20" is correct?
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