The routine data collection may also weaken the internal validity of the study, as these data may have been of varying quality and more subject to bias than those collected in more rigorous research situations.
Considering both rigorous and relaxed situations, this paper formulates two mixed-integer programming models of the integrated optimization models, to simultaneously assign locomotives to trains and schedule trains, so that train delay is minimized.
Rigorous models of this situation lead to the so-called population balance equations, which are integropartial differential equations.
This algorithm often uses in a situation of rigorous concept drift, with little or no correlation of the decision concepts between data chunk.
The MICS are a survey program developed by the United Nations Children's Fund to provide internationally comparable, statistically rigorous data on the situation of children and women.
"We have a series of rigorous protocols in place that are supposed to prevent situations like this, but they are only effective if followed," the club wrote in a statement, published by the Daily Student.
Taken together with other research, this experimental approach, with rigorous control over exposure situations and potentially confounding factors, supports the importance of this observation in elucidating a significant mechanistic pathway underlying the consistent epidemiologic evidence of air pollution-induced cardiovascular morbidity and mortality.
ALI represents a complex syndrome with different possible causes and origins, but also involves patients with complex conditions: 'standard' care has to be defined in detail in such situations, and rigorous control of physiological variables as well as therapeutic modalities is of the outmost importance [ 9].
BEHIND THE NEWS The declaration followed what Lisa Jackson, head of the Environmental Protection Agency, said was a "rigorous re-evaluation of the situation".
A more rigorous look into the physical situation shows that while waves are basically vertical oscillations of the water surface, the visible part of the wave is its front, which moves in a linear motion over the sea surface (though foam and the breaking of waves at high sea states can cause local distortions of this linearity).
