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 data differs from objective data. Objective data is obtained directly from the observations and other diagnostic methodologies of the medical professional. Objective data and subjective data may also be referred to as signs and symptoms respectively. There will often be a partial overlap between the two. For instance, a nurse might observe a patient shivering, coughing or scratching while the patient is reporting the symptoms to the nurse.