In the first case, there exists control policy which makes arbitrary state of the system reach to zero in one time step.
As is shown, there exist controls resulting in unbiased zero-variance estimators.
Is environmental memory, if it exists, controlled or incidental: evolutionarily advantageous, deleterious, or neutral?
Because no licensed vaccine exists, controlling or preventing dengue outbreaks is the only alternative, which is implemented by reducing its primary vector through monitoring and habitat control programs.
In contrast, when standard therapy does exist, controlling for placebo raises not only ethical but also practical issues, in that the usefulness of the results is ambiguous.
Although positive outcomes for mental health and well-being do exist, controlled evaluations of community-based obesity prevention interventions have not often included mental health measures (n=7).
Among other questions, it asks whether a relationship between family income and the outcome exists, controlling for the effects of the proportion of families in poverty in the state.
It can therefore be postulated that in the host plant, multiple resistance genes may exist, controlling resistance in a quantitative manner, as has been shown in potato, though this remains to be formally demonstrated.
In conclusion, studies in animals showed that two major balancing descending systems exist, controlling stretch reflex activity: the inhibitory dorsal reticulospinal tract on one hand and the facilitatory medial reticulospinal and vestibulospinal tract on the other.
