cutoff score

For my study, I'm using a scale (rating scale from 1-7) that doesn't have a predetermined cut-off score. However, in order to do the stats, I need to make 2 groups/categories with "high score" and "low score". How do I determine the point at which a participant is considered high vs. low...

Hi everyone, I have a research project where I am looking at the psychometric properties of a new questionnaire about body image. I have two samples: an eating disorder sample and an undergrad control sample. I wanted to see how well my questionnaire discriminates between clinical cases...