Research studies that were methodologically sound were selected for review.
It is both methodologically difficult and politically problematic to conduct empirical research on such issues.
Methodologically, these results were enabled by adopting a grammaticalization perspective on defining the envelope of variation.
Methodologically, the empirical task is one of dimensional analysis, using techniques such as multidimensional scaling or factor analysis.
On the one hand, this is methodologically not desired because of the principle of information hiding, which should be preserved.
We have been methodologically conservative in only retaining political variables significant over all four rounds.
Methodologically, the studies range from being ethnographic to experimental.
