Marginal structural models (MSMs) allow estimation of effect modification by baseline covariates, but they are less useful for estimating effect modification by evolving time-varying covariates. Rather, structural nested models (SNMs) were specifically designed to estimate effect modification by time-varying covariates. In their paper, Petersen et al. (Am J Epidemiol 2007;000:000–00) describe h...

the present paper undertakes to investigate the effect of an organization‘s structural capitals on recognition of entrepreneurial opportunities in knowledge-based companies at eqbal technology and science park of yazd province. the research sample included 75 executive managers working in the sample companies which on the ground of the limited number of the participants, the survey method was u...

an analytical nonlinear stress-strain model and a microscopic damage index for confined and unconfined concretes together with a macroscopic damage index for reinforced concrete (rc) structures under cyclic loading are proposed. in order to eliminate the problem of scale effect, an adjustable finite element computer program was generated to simulate rc structures subjected to cyclic loading. by...

The main purpose of this descriptive-correlative study was to design the structural equation model of agricultural entrepreneurship development in villages of Kamfiruz district, Marvdasht County in Iran. The population of the study consisted of all 3106 families of 20 villages. According to the Bartlett et al. table, a sample of 197 households was selected using stratified random sampling techn...

Background: Childbearing is considered to be one of the main purposes of marriage in Iranian culture.  The aim of this study was to assess relationships among age of marriage, religious and educational levels, participation of couples in childbearing and finical status with childbearing motivation using structural equation model. Materials and Methods: This study is a secondary analysis of pre...

A significant research base has increasingly substantiated that teachers are among the most significant players affecting student achievement in second language classrooms. As a result, teacher-related variables have enjoyed much research attention over the recent decades in both mainstream education and English Language Teaching (ELT). Likewise, the present study was set to test a stru...

The present study aimed at finding structural variations in the translated abstracts from Persian into English and comparing them with abstracts originally written in English and published in international journals in the area of medical sciences. To do this, 64 medical article abstracts (32 in Iranian journals, 32 in international journals) were analyzed and compared on the basis of Swales’ mo...

this paper describes a modified structural dynamics model for aeroelastic analysis of high-aspect-ratio wings undergoing large deformation behavior. to gain this aim, a moderate deflection beam model is modified with some important large deflection terms and then coupled with a state space unsteady aerodynamics model. finite element method is used to discretize the equations of motion. a dynami...

Multilevel modeling (MLM) is frequently used to detect group differences, such as an intervention effect in a pre-test–post-test cluster-randomized design. Group differences on the post-test scores are detected by controlling for pre-test scores as a proxy variable for unobserved factors that predict future attributes. The pre-test and post-test scores that are most often used in MLM are summed...

Since the amount spent on information technology (IT) keeps on increasing with time, senior management is rightly concerned with the evaluation of their capital investments in IT. However, despite significant progress in evaluating the productivity impacts from corporate investment in IT, the inability of traditional economic measures to fully account for intangible impacts has led to for calls...