How can I decide whether the attached is a correct ROC curve?
The underlying algorithm consists in calculating an ODE system and storing the number of certain cancer cells calculated by this model at the end of the simulation course. These end points are compared with experimental results for different thresholds.
It looks to me as if the model is not performing better then random guess, do I see this correctly?
I rerun the dataset with pROC package - the monotonicity is restored but the rest looks as it was symmetric wrt identity line compared to the original plot (which is worrisome because it means I cannot compute the ROC curve by myself).