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Monday, April 29, 2013

Testing mediating effects directly with WarpPLS


Since version 3.0, WarpPLS allows users to test mediating effects directly through inspection of coefficients generated for indirect and total effects, which include P values.

This allows for the direct test, without having to resort to intermediate calculations (e.g., Baron & Kenny; Preacher & Hayes), of mediation of various levels of complexity (e.g., multiple mediation).

WarpPLS also calculates total effects and respective P values, in addition to indirect effects. All of these are calculated whether linear or nonlinear analyses are conducted.

The two video clips below explain how to interpret indirect and total effects, and how to isolate complex mediating effects:

- View Indirect and Total Effects in WarpPLS

http://youtu.be/D9m4K_fv2vI

- Isolate Mediating Effects in WarpPLS

http://youtu.be/1wk5eedKupI

If you still want to use the Baron & Kenny and/or Preacher & Hayes approaches, please see the following blog posts:

http://warppls.blogspot.com/2010/07/testing-significance-of-mediating.html

http://warppls.blogspot.com/2011/06/testing-significance-of-mediating.html

7 comments:

Anonymous said...

I am trying to respond to a comment by a journal reviewer.

Could you explain how "moderated mediation", "mediated moderation" and "conditional indirect effect" can be tested using Warppls? Thanks

- Kevin

Ned Kock said...

The following video clips may be useful in this respect:

http://youtu.be/d8j-OOPHMFk

http://youtu.be/D9m4K_fv2vI

http://youtu.be/dSt0EgC-V80

http://youtu.be/1wk5eedKupI

Ned Kock said...

Also, see the following blog post and links therein:

http://bit.ly/15wbflh

Ramón said...

Hi, I´ve been using warps for a while. I´m conducting a moderation analysis but I couldn't find the conditional effect results. Where can I find them? Kind regards, Ramón

Ned Kock said...

Hi Ramon. The coefficients for moderating effects are shown in the path coefficients table under the columns with an “*” symbol. They are also shown in the model graph with results, but only up to two decimals. See the YouTube video linked below.

http://youtu.be/d8j-OOPHMFk

Mr. Me said...

Hi Ned: thanks for your reply. Sorry I didn't explain my self correctly. What I want to know where can't I find the conditional effect. conditional effects of X on Y at values of the moderator. What happens in the relationship of X and Y when the moderator is -1 SD, Mean and +1 SD. Kind regards

Ned Kock said...

Maybe you are referring to these graphs:

http://youtu.be/XEC2a3paJ98

The link above, as well as other links that may be relevant in this context, are available from:

http://warppls.com