Hi Andrew,

NBS is really great! Thank you for making it to the public.

Now I am using NBS to examine structural connection differences among four groups (which means that i need to do 6 pairs of comparisons).

I checked the paper [1] and found the relationship between effect size d and t values: d=t *sqrt(1/n1+1/n2),which means that I could determine a threshold for NBS; but for the effect size, there seems that no criteria  but I knew the small effect size (0.2), the medium effect size (0.5) and large effect size (0.8)... my question is: could you give me some suggestions about how to determine the threshold? and are there any papers talking about this that you would recommend?

Another question is: I have four groups, do you think comparing each pairs of the four groups (ttest) in terms of connection differences is a good way?

Thank you very much and looking forward to your reply.

All the best,
Ting

Hi Ting,

Comparing each pair of groups separately is ok. Alternatively, you may want to consider an ANOVA (F-test) to test whether any of the groups differ from each other. This would reduce the number of multiple comparisons. 

It is difficult to provide a concrete recommendation about the threshold without further knowledge of your project. Setting the threshold based on a minimum effect size of interest sounds reasonable. There is no right or wrong threshold. 

Andrew
Originally posted by Ting Qiu:

Hi Andrew,

Thank you so much for your reply.

Have a great one!

Ting