Negative loading and sign swtiching ... PreviousNext
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 xiangyu cong posted on Wednesday, December 05, 2012 - 6:55 am
Dear Dr. Muthen:

I am doing EFA with 31 categorical indictors.

After first run , I think 8 factors is good fit. Among 8 factors extracted, only one factor has three negative loading with absolute value greater than 0.4. After I removed 7 indicators that did not have any significant loadings on any of the 8 factors, suddenly, there are three factors have negative loadings. It is very hard to interpret the results.

Any comments?

Thanks!
 Linda K. Muthen posted on Wednesday, December 05, 2012 - 10:10 am
If the signs of all loadings switch from positive to negative, this is not a problem.
 xiangyu cong posted on Wednesday, December 05, 2012 - 11:56 am
Dear Linda:

Thanks so much for your reply.

Through EFA, I now have 8 factors and 24 indicators. The factors we identified through EFA are obviously correlated.

Next, I will run CFA with my model based on my EFA results. But, two of eight factors only has two indicators with loading higher than 0.3. Should I include additional indicators for these two factors (maybe lower the cutoff from 0.3 to 0.2) to make them each has at least three indicators each?

I guess short version of my question is:
"Is it OK that two out of eight factors in my model only has two indicators each in CFA?"


Thanks!
 Linda K. Muthen posted on Wednesday, December 05, 2012 - 1:04 pm
I would never recommend less than four factor indicators. This is a good question for SEMNET where I think there has recently been a discussion of this topic.
 xiangyu cong posted on Thursday, December 06, 2012 - 8:10 am
Thank so much! Linda. Your comments are deeply appreciated.

I am going back to my EFA results and refine my model before I going into CFA.

I will look into SEMNET for the discussion you mentioned.

Torry
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