In observational research in the general population, however, a continuum approach may be more useful than use of a qualitative cut-off point.
Their system proves fewer program transformations as equalities, requiring instead the more difficult notion of observational equivalence.
For example, it is well documented from observational studies that the last few months of life for persons with chronic conditions are very costly.
Specifically, it is likely that experimental data will be needed to replicate and extend the current findings based here on observational data.
The observational interpretation of specifications and refinements adds expressive power and flexibility, but introduces some subtle problems.
This observational study included patient-rated and clinicianrated scales administered twice at 4-week intervals.
Examining the role of parental frightened/frightening subtypes in predicting disorganized attachment within a brief observational procedure.
Local stability is also preserved under observational equivalence of constructions, which is defined as follows.
