It is worth remarking that all approaches to a generalized probability theory contain some mechanism for identifying outcomes of distinct measurements or values of distinct observables, though this mechanism varies from author to author.
While the plane is an observable object even though, in this case, only its effect is observed there is no observing the particle itself, as distinct from its supposed effects.
Percepts of others manifestly cannot be observed, though their properties can be inferred from observable behaviour (verbal and nonverbal).
Theory-theorists maintain the (controversial) position that, as theoretical posits, these states are not directly observed, though they are thought to account for observable effects like overt behavior.
Women earn an average 32.8% less than men in Russia, even though "observable factors" like education, experience and job role should mean they should probably make 11.1% more.
Health centre audits at the time of study (Jun. – Nov. 2011) found only one of the four facilities (HC 1) with an observable feedback system, though this was described by several staff as rarely used.
Even though observable outward signs of emotional expression are lessened in schizophrenia, studies indicate that sufferers continue to display very subtle facial muscle movements (as measured by electromyogram) that are similar to and in accordance with their responses [ 27].
