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.
who are high in terms of emotional well-being feel good about life, whereas those high in psychological and social well-being function well in life. Subjective well-being (SWB) consists of a combination of these two broad lines of research on positive emotions and positive functioning (cf. Ryan & Deci, 2001; Waterman, 1993).