All cognitive diagnostic models that evaluate educational test data require a Q-matrix combines every item in with the required skills for each to be answered correctly. Generally, is constructed by education experts' judgment, leading some uncertainty its elements. Various statistical methods are suggested validate misspecifications Q-matrix. This paper evaluates performance of validation meth...

This paper defines 5 key dimensions of student models: whether and how they model time, skill, noise, latent traits, and multiple influences on student performance. We use this framework to characterize and compare previous student models, analyze their relative accuracy, and propose novel models suggested by gaps in the multi-dimensional space. To illustrate the generative power of this framew...

2003;32:1–22. 4 Frayling TM, Timpson NJ, Weedon MN et al. A common variant in the FTO gene is associated with body mass index and predisposes to childhood and adult obesity. Science 2007;316:89–94. 5 Dina C, Meyre D, Gallina S et al. Variation in FTO contributes to childhood obesity and severe adult obesity. Nat Genet 2007;39:724–26. 6 Brennan P, McKay J, Moore L et al. Uncommon CHEK2 mis-sense...

Gregory M. Marcus, MD, MAS; Alvaro Alonso, MD, PhD; Carmen A. Peralta, MD, MAS; Guillaume Lettre, PhD; Eric Vittinghoff, PhD; Steven A. Lubitz, MD; Ervin R. Fox, MD, MPH; Yamini S. Levitzky, MD, MPH; Reena Mehra, MD, MS; Kathleen F. Kerr, PhD; Rajat Deo, MD; Nona Sotoodehnia, MD, MPH; Meggie Akylbekova, MS, MD; Patrick T. Ellinor, MD, PhD; Dina N. Paltoo, MPH, PhD; Elsayed Z. Soliman, MD, MSc, ...

با توجه به رشد بالای جمعیت در جهان و نیاز اطمینان از امنیت غذایی، افزایش تولید واحد سطح محصولات زراعی به‌منزلة راهبردی اساسی حل مسئلة تأمین غذا به‌شمار می‌رود. سوی دیگر، وجود محدودیت زیرکشت پایین‌بودن میانگین عملکرد برخی کشاورزی مانند گندم کشور، محصول می‌تواند راهکاری عملی پاسخ کشور محسوب شود. یکی مهم‌ترین بیماری‌های فوزاریوم است که، نقش پیش‌بینی این بیماری جلوگیری کاهش بهره‌وری محصول، مدل‌هایی...