Discourse markers (DMs) are linguistic elements that index different relations and coherence between units of talk. Most research on the development of these forms has focused on conversations rather than narratives. This article examines age and medium effects on use of various discourse markers in pre-school children. Fifteen normal Iranian monolingual children, male and female, participated ...

Consider the simple normal linear regression model for estimation/prediction at a new design point. When the slope parameter is not obviously nonzero, hypothesis testing and model selection methods can be used for identifying the right model. We compare performance of such methods both theoretically and empirically from different perspectives for more insight. The testing approach, in spite of ...