Clustering a single binary variable? I am trying to design a study which will involve asking people to watch videos and then stop them at points that they think relevant (looking for specific behaviours). The idea is to see if people stop the video at the same time - I’m struggling to think how I can add some statistical analysis to this? I thought a cluster analysis but as the data will be largely binary (ie I will have each second of the video with a stop / not stop identifier) I’m not sure what I can do?

I would simply do KDE on the time of stoppage.
You'll see something like YouTube videos show these days:

The grey bell shaped bumps on the image are the representation of frequency at which people jump into a point in the video.
