what is the purpose of a roth curve how to draw the ROC curve what is the rc curve for concrete dc test how is a rotor curve determined what is a rotor curve for testing concrete what is a ros curve used for do ndt testing work on slabs what is a ROC curve why do i use a ROC curve when conducting ndt why use roth curve why does roth curve do the same for ndt what is a rotor curve used for? how to use an roc curve when testing a concrete slab what is the correct name of the curve that you use to draw a curve on a concrete slab how tpr and fpr work how are dpr curves calculated when is a dt test used? how to draw a roto curve can a test be done with a single point? can roc curve be used to find a sensitivity