Identification of Peer Effects with Missing Peer Data: Evidence from Project STAR This paper studies peer effects on student achievement among first graders randomly assigned to classrooms in Tennessee’s Project STAR. The analysis uses previously unexploited pre-assignment achievement measures available for 60 percent of students. Data are not missing at random, making identification challengin...

Salah satu hal penting dalam analisis statistik adalah prosedur estimasi suatu fungsi padat peluang yang biasa disebut densitas. Ada dua metode pendekatan biasanya digunakan, yaitu parameter terkait dengan asumsi distribusi tertentu dan densitas secara non parametrik. Metode parametrik sering kita jumpai histogram.
 Beberapa kelemahan histogram menjadi acuan untuk dikembangkannya lain kern...

Rift Valley fever (RVF) is a zoonotic disease affecting humans and animals. It is caused by RVF virus transmitted primarily by Aedes mosquitoes. The data presented in this article propose environmental layers suitable for mapping RVF vector habitat zones and livestock migratory routes. Using species distribution modelling, we used RVF vector occurrence data sampled along livestock migratory rou...

introduction: the idea that factors during early critical periods of life affect on long term health is now a major public health concern. in this study, in addition to investigating obesity prevalence among female high school students in yazd, the relationship between obesity and birth weight was examined. materials and methods: this cross sectional study was conducted on 312 female high schoo...

the gastric cancer in iran is the fourth in the general population. this study was designed to determine the five-year survival rate of gastric cancer patients, and to assess its associated factors. we analyzed the data using a time-dependent covariates model, and recommend it for analyses of similar data. 281 gastric cancer patients with adenocarcinomatous pathology who had been operated on at...

the aim of the current research was to compare motor development in 3–6-year-old children from ahvaz with denver developmental screening test ii. themethodology of this research was descriptive – survey. the statistical populationconsisted of children from ahvaz and 1044 children aged between 3 and 6 wereselected from ahvaz kindergartens by cluster random sampling method. denverdevelopmental sc...

abstract background beta-thalassemia is a common hereditary hemoglobinopathy, which is a reason of microcytic hypochromic anemia. patients with major thalassemia require multiple blood transfusions. this study evaluated growth in thalassemic patient and relationship with ferritin level. materials and methods this is a cross sectional study on seventy patients (36 boys, 34girls) with transfusion...