Factor loading signs flipped PreviousNext
Mplus Discussion > Exploratory Factor Analysis >
 Li Lin posted on Thursday, February 18, 2010 - 10:45 am
I am repeating an EFA using the same data and the same Mplus code, but in different Mplus versions. The output were identical, except some factors had its factor loadings sign flipped(absolute values didn't change). What caused this change in the sign? Would this be a problem for using the EFA analysis result? Please help. Thanks!

Part of the output:
Mplus VERSION 5 -
1 2
________ ________
SFGLO01 -0.419 -0.444
SFDES01 -0.895 -0.028
SFDES02 -0.909 0.133
SFDES03 -0.866 0.345
SFDES04 -0.721 -0.193
RECDES05 -0.597 -0.419
RECDES06 -0.024 -0.555
RECDES07 -0.088 -0.727
SFDES08 0.217 -0.413

Mplus VERSION 5.21 -
1 2
________ ________
SFGLO01 0.419 0.444
SFDES01 0.895 0.028
SFDES02 0.909 -0.133
SFDES03 0.866 -0.345
SFDES04 0.721 0.193
RECDES05 0.597 0.419
RECDES06 0.024 0.555
RECDES07 0.088 0.727
SFDES08 -0.217 0.413
 Linda K. Muthen posted on Thursday, February 18, 2010 - 11:12 am
If all of the signs in a column change, this is not a problem. There was probably a slight algorithm change between Version 5 and 5.21. It just changes the factor meaning from, for example, inability to ability.
 Chie Kotake posted on Wednesday, April 30, 2014 - 2:03 pm

I have a similar situation, but I'm using the same version to test 2 models.

Basically, the first model is correlating two variables (A<-->B). The second model uses the same model, except now it's A predicting B (A-->B).

The first model has positive factor loadings, but when I switch to the second model, the factor loading sign and the means signs flips.

Do you have any suggestion as to why this is occurring? I'm using version 7.11.

Thank you so much for your help!
 Linda K. Muthen posted on Wednesday, April 30, 2014 - 2:36 pm
It just finds the opposite solution. This is not a problem. Use positive starting values for the one that switched.
 Sebastian Therman posted on Thursday, January 15, 2015 - 5:50 am

I'm doing a single-dimensional factor analysis of categorical items where I'd like to obtain flipped loadings.
I tried to fix the loading of the first indicator to -1 rather than 1, but wasn't able to deduce the correct syntax for this.

f1 by y1-y5;
 Bengt O. Muthen posted on Thursday, January 15, 2015 - 6:27 am
f1 by y1@-1 y2-y5*-1;
 Sebastian Therman posted on Friday, January 16, 2015 - 5:24 am
Tack så mycket! (Thank you very much!)
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