Some of the most expensive fighters such as the US F-14 Tomcat, F-15 Eagle, F-22 Raptor and Russian Su-27 were employed as all-weather interceptors as well as air superiority fighter aircraft, while commonly developing air-to-ground roles late in their careers.
The health service measures that best predict subjective health status should be identifiable. Following her further degree in clinical epidemiology and biostatistics, her interest turned to the development of methods to measure subjective health status.
Examples of subjective data from a patient's perspective include itching, worrying, internal perceptions and pain. Subjective data are generally referred to as symptoms as described by the patient, according to Brookside Associates. Objective data are detectable to an observer or can be tested against accepted standards.