Re: Fwd: Latent Variable Analysis: CFA, EFA, and IRT?
Posted by
Art Kendall on
Jan 20, 2014; 10:21pm
URL: http://spssx-discussion.165.s1.nabble.com/Fwd-Latent-Variable-Analysis-CFA-EFA-and-IRT-tp5724030p5724032.html
Please
give more details.
Do you mean that the instrument has two scales?. I.e.,
some items go into one score and other items go into another
score?
Or do you mean that the he instrument produces one score and you
think it should produce 2 scores.
What constructs is the instrument designed to measure? What
constructs do you think it should measure?
Has the instrument be psychometrically validated?
How did the authors of the instrument validate the score?
How many items are there? What is the response scale?
What are the items and how do you think they should be grouped?
How many cases do you have?
Art Kendall
Social Research Consultants
On 1/20/2014 4:46 PM, Deena Isom [via SPSSX Discussion] wrote:
---------- Forwarded message ----------
From:
Deena Isom <[hidden
email]>
Date: Mon, Jan 20, 2014 at 4:38 PM
Subject: Latent Variable Analysis: CFA, EFA, and IRT?
To:
[hidden email]
Hello List,
I'm trying to determine which analytical strategy is
best for a current project, and if any are adequately
conducted in SPSS or if another stats package is needed.
I'm trying to assess if two latent constructs are truly
distinct, when in most literature items assessing
each they are measured together in one scale..... I
believe this is best done with exploratory factor
analysis to see how different questions load of different
factors, but if I believe they are different, would
confirmatory factor analysis better serve these purposes -
force their loadings? Also, can either of these really be
fully conducted in SPSS and provide information about fit
and so forth? And finally, could item response theory
help distinguish which questions measure which concepts?
Honestly, I'm still confused by IRT.
Thanks in advance for your insight. Hope you had a
wonderful holiday!
--
~Deena
--
~Deena
Art Kendall
Social Research Consultants