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.
Subjective things depend on your own ideas and opinions: there isn't any universal truth. Subjective is the opposite of objective, which refers to things that are more clear-cut. That Earth has one moon is objective â it's a fact. Whether the moon is pretty or not is subjective â not everyone will agree. Facts are objective, but opinions are subjective.