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.
Weakness may be subjective or objective: 1  Subjective means you feel weak, but there is no real loss of strength. For example, you may feel weak if you have an infection such as mononucleosis or the flu. 2  Objective means there is a loss of strength that can be noted during a physical exam.