نتایج جستجو برای: 2007 301 using generated data can help fill missing or even to correct erroneously measured data fodor et al

تعداد نتایج: 12393031  

2009
MICHAEL PARZEN GARRETT M. FITZMAURICE STUART R. LIPSITZ JOSEPH IBRAHIM STEVEN LIPSHULTZ

1 Summary Missing covariate data is a common problem that complicates the fitting of regression models (e.g., generalized linear models) in many applications. A recently developed technique for handling missing covariate data is the weighted estimating equations (WEE) approach (Robins et al., 1994; Lipsitz et al., 1999). In the WEE approach, the contribution to the estimating equations from a c...

Introduction: Due to importance of data quality, issues relating to filling the missing data has found a great deal of interest. Regeneration methods for missing data can be classified into two kinds of classical and modern categories. Application of statistical methods such as relationship with nearby stations and approaches on the base of hydrological, climatological or physiographical simila...

Journal: :فیزیک زمین و فضا 0
بهروز اسکویی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه امیرحسین جواهری کوپائی دانش آموخته، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه احمد علی بهروزمند دانش آموخته، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه

magnetotelluric (mt) method is an electromagnetic method which provides information about subsurface conductivity structures using earth's natural electromagnetic fields. static shift is one of disorders arising from shallow conductors; therefore static shift must be corrected as one of mt data processing steps. in the absence of sufficient information about the near surface distortions, w...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه امام رضا علیه السلام - دانشکده زبانهای خارجی 1393

writing an academic article requires the researchers to provide support for their works by learning how to cite the works of others. various studies regarding the analysis of citation in m.a theses have been done, while little work has been done on comparison of citations among elt scopus journal articles, and so the dearth of research in this area demands for further investigation into citatio...

پایان نامه :0 1392

nowadays in trade and economic issues, prediction is proposed as the most important branch of science. existence of effective variables, caused various sectors of the economic and business executives to prefer having mechanisms which can be used in their decisions. in recent years, several advances have led to various challenges in the science of forecasting. economical managers in various fi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده زبانهای خارجی 1390

this study was conducted to investigate the impact of podcasts as a learning and teaching tool on iranian efl learners’ motivation for listening as well as on their listening comprehension ability. the study also investigated the learners’ perception towards listening to podcasts and examined whether the learners were likely to accept podcasts. out of fifty-five intermediate learners studying e...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - پژوهشکده ادبیات 1391

the major purpose of this study was to develop the translation teacher competency test (ttct) and examine its construct and predictive validity. the present study was conducted in two phases: a qualitative phase as well as a quantitative phase. in the first phase of the study, the author attempted to find out the major areas of competency required for an academic translation teacher. the second...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 0

a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...

Journal: :مدیریت فرهنگ سازمانی 0
روح اله رضائی دانشیار، دانشکدة کشاورزی، دانشگاه زنجان، ایران نفیسه صلاحی مقدم کارشناس ارشد، دانشکدة کشاورزی، دانشگاه زنجان، ایران

the main purpose of this descriptive- correlative research was to study of the effect of organizational culture components on knowledge management in agricultural consulting, technical and engineering services ventures (actesv). the statistical population of the research consisted of all experts in the actesv in zanjan province (n= 301). according to the bartlett, et al. (2001), a sample size o...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده ادبیات و زبانهای خارجی 1390

abstract the present study was conducted to investigate the effectiveness of a rather newly developed method in language teaching that is the use of paragraph reading task and whole reading task and their effects on improving efl learner’s speaking ability. to fulfill the purpose of the study, first 90 participants studying their course at sa eedi high school in tehran were chosen by means of ...

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