I have a set of data and want to know whether they fall in 1, 2 or 3 groups.
I started exploring the question by using k-means in MATLAB. By just looking at the distance from the centroid of each cluster by eye it looks like I might have two clusters, but I would like to be able to back this up with some statistics.
I have read that using BIC might be a good way.
I am new to clustering, which means that when I read all the answers to questions similar to this one that refer to research papers on the topic, I just cannot follow them, and I was hoping that someone can give me some basic information on whether BIC or something else might be suitable, and some MATLAB code (computing BIC or something similar) with explanations for dummies (I am also new to MATLAB), so that I can use it.