Comparing the performance of predictive models of student success has become a central task in the field of learning analytics. In this paper, we argue that research seeking to compare two predictive models requires a sound statistical approach for drawing valid inferences about comparisons between the performance of such models. We present an overview of work from the statistics and machine le...

With the popularity of massive open online courses (MOOCs), grading through crowdsourcing has become a prevalent approach towards large scale classes. However, for getting grades for complex tasks, which require specific skills and efforts for grading, crowdsourcing encounters a restriction of insufficient knowledge of the workers from the crowd. Due to knowledge limitation of the crowd graders...

the geographical scope of a dynasty and the selection of a capital as the center of its power can be considered as the essential factors in the establishment of a regime and its continuity; this matter seems to be neglected in the political structure of khwarazmshahi dynasty (598-628/1202-1231). the khwarazmshahi which were supposed to change into one of the greatest medieval dynasties led the ...