The increasing availability of data from multisite randomized trials provides a potential opportunity to use instrumental variables (IV) methods to study the effects of multiple hypothesized mediators of the effect of a treatment. We derive nine assumptions needed to identify the effects of multiple mediators when using site-by-treatment interactions to generate multiple instruments. Three of t...

mental health in adolescents is influenced by several factors. body image is one of the factors in predicting mental health. moreover, it affects social communication and creates the social anxiety. the present study is cross-sectional and correlational. the statistical population is the guidance and high school students in shiraz in 2013-2014 that 180 students include 101 girls and 79 boys wer...

According to studies, self-esteem plays an important role in mental health. Self-esteem is also one of the most important correlates of anxiety, especially social anxiety. Being anxiety in adolescents make negative impacts on their academic performance, mental health and social function. This study aims to investigate the relationship between self-esteem and mental health, according to the medi...

Mental health in adolescents is influenced by several factors. Body image is one of the factors in predicting mental health. Moreover, it affects social communication and creates the social anxiety. The present study is cross-sectional and correlational. The statistical population is the guidance and high school students in Shiraz in 2013-2014 that 180 students include 101 girls and 79 boys wer...

In this paper, I propose that the availability of a bound variable reading for pronouns is predictable from their morphological structure of the pronouns. More specifically I argue that noun-containing pronouns cannot be bound variables. My proposal is different from D&W's (2002) argument in that in their theory, every DPs cannot have a bound variable reading, while in my theory, even DPs can h...

The equivalence between autonomicity and the absence of free variables is a well-known result for linear, shift-invariant and complete behaviors over a field. However, this no longer holds for a behavior that does not satisfy one of those properties. In this paper we consider linear, shift-invariant and complete behaviors over the ring Zpr and study under which conditions such behaviors are aut...