Once again we continue the case study from above. In this exercise you will plot the ROC curve and produce a new function to calculate the You den index which will be used to calculate our “best”...

Once again we continue the case study from above. In this exercise you will plot the ROC curve and produce a new function to calculate the You den index which will be used to calculate our “best” threshold. To do this, perform the following tasks:

(i) Plot the values of Se and Sp that you obtained in the previous exercise as an ROC curve (see Section3.3).