I'm currently undertaking research creating cut-off scores using ROC curves. I have encountered some confusion regarding the outcome variable. My outcome variable can range in score from 10-50, and we are using a cut-off previously established of 20 to say whether the outcome is present or not in the individual.
Is it possible to conduct the analysis using a continuous outcome variable? Or would I need to compute another variable transforming my outcome variable into categories of 1) less than 20 and 2) greater than or equal to 20.
Additionally, I am having difficulty knowing if there are any assumptions relating to ROC curves.
Thank you for any possible help which is received.