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Moderation and mediation
Posted: Thu Jan 25, 2018 6:17 pm
by Mojtaba
Hi,
Thanks for the great software!
I have following questions about moderation and mediation:
1. is the output of indirect effect based on Sobel test?
2. it would be very useful to have the N in result of the simple slope analysis
Thanks ahead,
Mojtaba
Re: Moderation and mediation
Posted: Fri Jan 26, 2018 6:48 pm
by Ravi
Hi Mojtaba,
To answer your questions:
- Yes, by default the same test as Sobel is used (Delta method). However, it is often recommended to use the bootstrapped method instead because it gives better estimates of the standard errors.
- Why would it be useful to include N in the result of the simple slope analysis?
Cheers,
Ravi
Re: Moderation and mediation
Posted: Thu Feb 01, 2018 10:57 am
by Mojtaba
Hi Ravi,
Thanks for the reply.
Similar to other analyses, it is essential to know how many subjects have been assigned to each 3 groups (low, intermediate, high) because as you know N influences the effect size and this report shows the reliability and power of the results. In simple word, how trustable is the finding. For instance, in my data, I had only 4 participants in low grou, which means any comparison with this group is extremely weak.
Cheers,
Mojtaba
Re: Moderation and mediation
Posted: Tue Feb 06, 2018 12:41 am
by Ravi
These values (-1SD, Average, +1SD) are based on the model, not on the individual cases. These are basically just linear formulas where we use a different value of the moderator (-1SD, Average, +1SD) to calculate the individual estimates. So there is not really such a thing as N here.