Help

Hello everyone, I am a student in environmental hydrogeology,

I am working on an area of ​​10km2 (5x2km) and in the study area there are about 18 water points. I had to select 6 sampling points out of the 18 points, then I performed a multivariate statistical study with the 6 points.

But unfortunately my potential reviewer disagrees with my treatment of the data and states that a statistical study (PCA and correlation matrix) is only feasible from 20 samples or more.



I would like to have strong statistical arguments to defend my points seen, because all of my work depends largely on statistics ... please help me.