Inner VIF vs Outer VIF

Small talk on SmartPLS that does not correspond to the other forums!
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mlkhabir
PLS Junior User
Posts: 1
Joined: Tue Feb 04, 2020 10:14 am
Real name and title: Md Latiful Khabir

Inner VIF vs Outer VIF

Post by mlkhabir » Tue Feb 04, 2020 10:28 am

Hello All,

As far as I am aware of, VIF is used to assess the collinearity problem among the constructs in a model. However, as I have recently moved to smartpls 3.0, I can see that there are two VIF tables, namely, inner (related to items of each construct) and outer VIF values (related to constructs). For a reflective model, does one have to report both? Thank you in advance.

Regards,

Khabir

jmbecker
SmartPLS Developer
Posts: 1110
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: Inner VIF vs Outer VIF

Post by jmbecker » Sun Apr 12, 2020 3:48 pm

The inner VIF reports the VIF for the inner/structural model. You need to assess these for the interpretation of your path coefficients (i.e., collinearity among the constructs).
The outer VIF report the VIF for the outer/measurement model. You need to assess these for the interpretation of your formative constructs only. It assesses the collinearity among the indicators of a construct. For reflective indicators these values should be high and thus are not meaningful to assess.
Dr. Jan-Michael Becker, University of Cologne, SmartPLS Developer
Researchgate: https://www.researchgate.net/profile/Jan_Michael_Becker
GoogleScholar: http://scholar.google.de/citations?user ... AAAJ&hl=de

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