refer to

1.http://ftp.cs.ucla.edu/pub/stat_ser/r370.pdf

2.https://pdfs.semanticscholar.org/2e69/92a1871cf1e3a8aff824f6edc3d795c6f162.pdf

Dear by applying SEM through Amos you will not get any Alpha value. But it will give you Beta values for the variables in the study. The causal model will look like as:

Y=b1x1+b2x2+................bzxz+e

Dear Srikanth,

I suggest that you follow these three valuable references about using goodness-of-fit index (GoF) and relative goodness-of-fit index (GoFrel) for model validation in CB-SEM:

• Henseler et al., "Goodness-of-fit indices for partial least squares path modeling", 2013 -  https://link.springer.com/article/10.1007%2Fs00180-012-0317-1
• Sarstedt et al., "On the Emancipation of PLS-SEM: A Commentary on Rigdon (2012)" - 2014, http://booksc.org/book/22965387/e5f2b3
• Dijkstra et al., "Consistent Partial Least Squares Path Modeling", 2015 - https://www.researchgate.net/profile/Joerg_Henseler/publication/265316206_Consistent_Partial_Least_Squares_Path_Modeling/links/54ab02070cf2ce2df668d7ca/Consistent-Partial-Least-Squares-Path-Modeling.pdf

In addition, from a more practical point of view:

• Lowry et al., "Partial Least Squares (PLS) Structural Equation Modeling (SEM) for Building and Testing Behavioral Causal Theory: When to Choose It and How to Use It", 2014 - http://www.kolobkreations.com/PLSIEEETPC2014.pdf
• Hooper et al., "Structural Equation Modelling: Guidelines for Determining Model Fit", 2008 - http://arrow.dit.ie/cgi/viewcontent.cgi?article=1001&context=buschmanart
• Bagozzi et al., "Specification, evaluation, and interpretation of structural equation models", 2012 - http://hbanaszak.mjr.uw.edu.pl/TempTxt/BagozziYi_2012_Specification,%20evaluation,%20and%20interpretation%20of%20SEM.pdf

Best Regards

Article Consistent Partial Least Squares Path Modeling