# Only four values per site - how do I detect outliers (with MAD)?

I have four weights. I want to test if there is an outlier within those four weights.

To me, the number seems quite small to detect outliers.

I thought that the Median Absolute Deviation (MAD) may be a way to detect outliers.

I used it in R with

D[which((abs(D-median(D))/mad(D)) >2)]

where D is those numbers:

[1,] 1.2492
[2,] 1.2885
[3,] 1.1707
[4,] 1.3207


The result was numeric (0). This has to do with the >2 term (which is supposed to mean 2 MAD -SDs away from the middle mad or so). Does that mean there is no outlier within this group?

Is this actually a sound way to check for an outlier in this specific case?

THANK YOU!