Convergent validity of reflective indicators

Frequently asked questions about PLS path modeling.
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BenLien
PLS Junior User
Posts: 2
Joined: Tue Apr 25, 2017 9:06 am
Real name and title: Phd. student, Benjamin Liengaard

Convergent validity of reflective indicators

Post by BenLien » Mon Mar 19, 2018 3:12 pm

In the book complementing the SmartPLS software (A Primer on Partial Least Squares), we are advice to asses the convergent validity with reflectively measured constructs.
The actual measures listed under "convergent validity" are AVE and indicator reliability. But convergent validity is the extent to which a measure correlates positively with alternative measures of the same construct. The loadings used to asses indicator reliability are the correlation between the latent variable and a standardized indicator. But the LV is constructed from the indicators (including the one where we asses the loading). In this respect we are not assessing whether the indicator are correlated with alternative measures of the same construct, but how it correlates with a LV made up partly by the indicator we asses. How can it then be justified to say that we are assessing convergent validity by looking at the indicator reliability?
I also find it confusing that we asses validity by a reliability measure (indicator reliability)?
Best
BenLien

jmbecker
SmartPLS Developer
Posts: 820
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: Convergent validity of reflective indicators

Post by jmbecker » Fri Mar 23, 2018 5:03 pm

Some researchers think that the construct and the indicators are so different that assessing the loadings (correlations between construct and indicators) is a form of convergent validity. Other researchers do think like you and think that using the own indicators cannot assess convergent validity (I would agree with you). However, traditionally, the first view has often been advocated and I think the authors of the book (I am not part of the authors) refer to some extend to this more traditional view.
Dr. Jan-Michael Becker, University of Cologne, SmartPLS Developer
Researchgate: https://www.researchgate.net/profile/Ja ... v=hdr_xprf
GoogleScholar: http://scholar.google.de/citations?user ... AAAJ&hl=de

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