Author/Editor		Božikov, Jadranka; Zaletel-Kragelj, Lijana
Title		Tests validity measures and analysis of the Receiver operating characteristic (ROC)
Type		članek
Source		In: A handbook for teachers, researchers and health professionals : analysis - planning - evaluation Lage : Jacobs
Publication year		2013
Volume		str. 417-429
Language		eng
Abstract		Diagnosis is based on the results of diagnostic tests. Most of them are imperfect instruments, and make errors in both directions - a healthy individual can be classified as diseased, and vice versa. Ability of each diagnostic test to correctly classify patients as diseased or healthy is called validity of the test. The concept applies also in screening tests. There exist several nosological (sensitivity, specificity, etc.) and diagnostic measures (positive predictive value, negative predictive value) to assess validity of a test with a binary outcome. In other tests, ROC method could be used as a method of analysis.
Keywords		diagnostic tests false negative rate false positive rate negative predictive value positive predictive value screening test sensitivity specificity validity