Plotting the moderation effect

[Janez Gorenc]

Hello, 

I have created a SEM with direct and indirect effects, it works like magic. But now I'd like to plot the moderation effects, like in the picture (which is symbolic):

The plot in the picture was created by plotMod(), but this only works with lm().

So, my questions:

1. Can I plot the moderation effrect with the fit results begotten from lavaan?

2. If this is not possible,  I would use poltMod(), but the problem is how to transform my regression code into one fit for lm()? Can someone please help? Thank you!

Here is the code:

SEM_model4<-'
          #regressions model
          ZEA4items~b1*ZEC3dim+b2*ZESEsum+b3*ZESExZEC
          ZEA2~c*ZEA4items+a1*ZEC3dim+a2*SPOL+a3*DRUZ_BINAR#+e*ZESEsum
         
          #covariances
          ZEC3dim~~ZESExZEC
          ZEC3dim~~ZESEsum
          ZESEsum~~ZESExZEC

          #variances
          DRUZ_BINAR~~DRUZ_BINAR
          SPOL~~SPOL
          ZEA2~~ZEA2
          ZEC3dim~~ZEC3dim
          ZESEsum~~ZESEsum
          ZEA4items~~ZEA4items
          ZESExZEC~~ZESExZEC
         
          # key
          ## IV - ZEC3dim
          ## Z - ZESExZEC
          ## M - ZEA4items
          ## DV - ZEA2
          ## ESE - ZESEsum
          ## SPOL - SPOL
          ## DRUZ - DRUZ_BIN
         
          #indirect
          indirect_IV_M_DV:=b1*c
          indirect_Z_M_DV:=b3*c
          indirect_ESE_M_DV:=b2*c
          
          #direct
          direct_M_DV:=c
          direct_Z_M:=b3
          direct_IV_M:=b1
          direct_ESE_M:=b2
          direct_IV_DV:=a1
          direct_SPOL_DV:=a2
          direct_DRUZ_DV:=a3

  
          #total
          Total_IV_DV:=b1*c+a1
          Total_Z_DV:=b3*c+0
          '

[Christian Arnold]

Are there any moderators in your model? If you have four points (that's what the graph looks like), plotly is a strong package.

---

From: lav...@googlegroups.com <lav...@googlegroups.com> on behalf of Janez Gorenc <janez...@gmail.com>
Sent: Friday, June 30, 2023 7:27:31 PM
To: lavaan <lav...@googlegroups.com>
Subject: Plotting the moderation effect

 

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[Janez Gorenc]

Does plotly work with lavaan outputs?

Yes, the moderator in my model is ZESExZEC.

To view this discussion on the web visit https://groups.google.com/d/msgid/lavaan/AM0PR04MB595533F66AD7B034482A8947FC2AA%40AM0PR04MB5955.eurprd04.prod.outlook.com.

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Janez Gorenc

LinkedIn

tel: +386 40 300 253

[Christian Arnold]

Then you just have to calculate the points to create the diagram with any package, right? What exactly is your problem about?

---

From: lav...@googlegroups.com <lav...@googlegroups.com> on behalf of Janez Gorenc <janez...@gmail.com>

Sent: Friday, June 30, 2023 10:15:30 PM
To: lav...@googlegroups.com <lav...@googlegroups.com>
Subject: Re: Plotting the moderation effect

 

To view this discussion on the web visit https://groups.google.com/d/msgid/lavaan/CAEwdaNYOwHXGy%2BpOJnNqjNdVf07HWd75C4kvjd1bUh77mkPs_w%40mail.gmail.com.

[Shu Fai Cheung (張樹輝)]

Hi,

You can try the plot-method for the output of cond_indirect_effects() from the manymome package:

https://sfcheung.github.io/manymome/reference/plot.cond_indirect_effects.html

https://sfcheung.github.io/manymome/reference/cond_indirect.html

Despite the name "cond_indirect_effects", it can also be used for a moderated path without mediators. Just omit the argument "m" for mediator(s).

Actually, the plot method only supports a path without mediators (for now).

The second example in the help page of the plot-method is similar to your case. The model has mediators but the method can still be used on paths not moderated.

Hope this helps.

-- Shu Fai

P.S.: The plot looks similar to that in plotmod() because it was indeed an extension of plotmod() for SEM results.