discrepancy for cronbach alpha between smartpls and spss

Frequently asked questions about PLS path modeling.
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carole
PLS Junior User
Posts: 8
Joined: Mon Oct 10, 2016 10:37 am
Real name and title: carole fantini, researcher

discrepancy for cronbach alpha between smartpls and spss

Post by carole » Thu Nov 29, 2018 12:29 pm

Hi
I have a latent construct with tow manifest variables (reflective) highly correlated (.91). smartpls estimate the cronbach alpha to .55 while SPSS give .82. I d'on't understand why...could you help about this?
thanks
carole

jmbecker
SmartPLS Developer
Posts: 879
Joined: Tue Mar 28, 2006 11:09 am
Real name and title: Dr. Jan-Michael Becker

Re: discrepancy for cronbach alpha between smartpls and spss

Post by jmbecker » Thu Nov 29, 2018 2:54 pm

I think this has been answered several times here in the forum: The difference comes from standardizing the variables in PLS. If you calculate Cronbach’s Alpha on the standardized variables in SPSS you should get the same result.

Another possibilities are untreated missing values or problems when importing variables with decimal signs (and not correctly choosing the decimal separator).
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

carole
PLS Junior User
Posts: 8
Joined: Mon Oct 10, 2016 10:37 am
Real name and title: carole fantini, researcher

Re: discrepancy for cronbach alpha between smartpls and spss

Post by carole » Thu Nov 29, 2018 3:07 pm

thanks a lot. I have searched on the forum without any success..I have probably entered an incorrect request...

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