Twitter is a widespread social media, which rapidly gained worldwide popularity. Pursuing on the problem of finding related tweets to a given organization, we propose supervised and semi-supervised based methods. This is a challenging task due to the potential organization name ambiguity. The tweets and organization contain little information. The organizations in training data are different wi...

This research study employed a mixed-methods approach to investigate the test takers’ perceptions and anx- iety in relation to an English language proficiency test called Community English Program (CEP). This study also evaluated the direct and semi-direct modes for speaking module of this test. To this end, 300 Eng- lish as Foreign Language (EFL) students were recruited in the study as test ta...

In a causal graphical model, an instrument for a variable X and its effect Y is a ran­ dom variable that is a cause of X and in­ dependent of all the causes of Y except X (Pearl 1995). For continuous variables, in­ strumental variables can be used to estimate how the distribution of an effect will respond to a manipulation of its causes, even in the presence of unmeasured common causes (con­ fo...