The Second Order model is not the preference of any researcher, rather it is due to the items measuring a particular construct loads into several distinct components in the EFA. And this is supported by theory. Thus, the researcher needs to treat the components as the sub-constructs, and that particular construct has become a second order construct. Therefore, the researcher needs to carry out second order CFA instesd of the usual first order.

The second order CFA is a statistical method to confirm that the theorized construct in a study loads into certain number of underlying sub-constructs. E.g: service quality (main construct) consists of five constructs (sub-construct) based on theory posited..so, the five constructs were considered as sub-construct and each sub-constructs is measured using certain number of items.

The Second Order model is not the preference of any researcher, rather it is due to the items measuring a particular construct loads into several distinct components in the EFA. And this is supported by theory. Thus, the researcher needs to treat the components as the sub-constructs, and that particular construct has become a second order construct. Therefore, the researcher needs to carry out second order CFA instesd of the usual first order.

The second-order model represents the hypothesis that these seemingly distinct, but related constructs can be accounted for by one or more common underlying higher order constructs.

1. In SEM we can have sets of Two Variable like

Exogenous variables=independent ; Endogenous variables =dependent

Observed variables =measured ; Latent variables=unobserved

etc. can be considered.

Refer

1.   AMOS – Analysis of Moment Structures

Rick Zimmerman, Olga Dekhtyar

Link:   Rick Zimmerman, Olga Dekhtyar

Likewise Refer

2.   Implications of second-order factor models and measurement invariance in psychological research were discussed in the Article

Testing Measurement Invariance of Second-Order Factor Models

Fang Fang Chen, Karen H. Sousa, and Stephen G. West

Arizona State University

Second-order models are most typically applicable in research contexts in which measurement instruments assess several related constructs, each of which is measured by multiple items. The second-order model represents the hypothesis that these seemingly distinct, but related constructs can be accounted for by one or more common underlying higher order constructs. For example, in a recent application in personality research, evidence suggests that measures of self-esteem, neuroticism, locus of control, and generalized self-efficacy may all be accounted for by a common higher order general factor, and after controlling for the general factor, each trait has little additional ability to predict external criteria (Judge, Erez, Bono,& Thoresen, 2002). In comparison to first-order models with correlated factors,second-order factor models can provide a more parsimonious and interpretable model when researchers hypothesize that higher order factors underlie their data.

Link:   http://www.psych.udel.edu/pdfs/publications/Chen_Sousa_West_Second-Order_SEM_2005_1.pdf

P.S.

Dear Friends, Thanks to every one.

Dear, you may follow this link on RG

https://www.researchgate.net/post/How_can_I_perform_second_order_factor_analysis_in_SPSS

Regards 

Dear Chalamalla srinivas Garu,

Now I see that the Link is not Opening.

Instead you may go to  Download Links to get the PPT Presentation.:

1. http://www.powershow.com/view4/462fe0-OTM5Y/AMOS_powerpoint_ppt_presentation

2. http://www.powershow.com/view4/462fe0-OTM5Y/AMOS_powerpoint_ppt_presentation

P.S.

Dear Hod

> Anyone  knows why fit indices of first order model and second order model are identical ? (using Amos)

If you have 3 first order latent variables and one higher order latent variable this second order model is equivalent to a correlated first order mode. You are simple replacing three second-order factor loadings for three first-order correlations.

You'll need some constraints on the second-order loadings (2 or more being equal) to compare the fit.

Mark

Dear,

Please go to James Gaskin website. He provides very useful video clips on many SEM issues and notes. Please visit his website at

http://statwiki.kolobkreations.com/

researcher has to use second order model when a phenomenon supposed to be measured by single factor but split in two or more parts

Second order model is used when two constructs have high correlation