As the TIMSS data has a cross-cultural perspective, it is a good source to use if researchers want to establish generalized theories, as research studies that integrate different cultural perspectives are crucial for establishing more useful and universal theories (Leung and Zhang 1995; Van de Vijver 2000).
Designed as research studies, impact assessments have often served accountability and public awareness purposes.
Many of the measures used to assess the components were developed in low-stakes settings, such as research studies or self assessments, where there were few, if any, consequences attached to a particular score.
Single self experiments have been categorised as self indulgence or abuse, and trivial interventions masquerading as research studies as a source of amusement.
There is some concern that evaluation studies are not as rigorous as research studies [ 27], which may help to account for the apparent lack of high quality studies.
As research studies look more specifically at the effect of individual pollutants, a unique set of candidate genes and polymorphisms is expected for each pollutant.
The Academy Health Methods Council defines CER as "research studies that compare one or more diagnostic or treatment options to evaluate effectiveness, safety or outcomes" [ 26].
Policy-makers in this study consistently recognized the importance of the relevance of evidence, and expressed openness to the types of evidence that are acceptable; these include non-experimental evidence as well as research studies published in scientific journals.
This 'spatial heterogeneity' in tumors is becoming more widely recognized in solid tumors [ 4, 61, 63] as research studies begin to sample multiple regions within solid tumors for genomic studies.
Clinical observations of co-morbidities associated with lupus are stimulating more comprehensive management of lupus patients as well as research studies to determine lupus-related mechanisms involved in premature atherosclerosis, catastrophic antiphospholipid syndrome, and fetal loss.
