Attrition in online learning is generally higher than in traditional settings, especially in large-scale online learning environments. A systematic analysis of individual differences in attrition and performance in 20 massive open online courses (<i>N</i> > 67,000) revealed a geographic achievement gap and a gender achievement gap. Online learners in… (More)
While MOOCs offer educational data at a new scale, many educators have been alarmed by their high dropout rates. Learners join a course with some motivation to persist for some or all of the course, but various factors, such as attrition or lack of satisfaction, can lead them to disengage or totally drop out. Educational interventions targeting such risk… (More)
(edX) for their contributions in refining the schema. This work has also been supported by a number of UROPs at MIT.
—We present a new efficient video stabilization method based on Dual-Tree Complex Wavelet Transform (DT-CWT). Our method relies on three distinctive techniques in achieving robust stabilization. Our first technique makes use of the linear relationship between the phase changes of DT-CWT and the feature displacement in the spatial domain to perform motion… (More)
Although modern hand-held devices, such as digital camcorders and smartphones, have enabled everyday users to capture high-quality video sequences, the quality of hand-held videos often suffers from unavoidable shaky camera motion. Video stabilization aims to remove this annoying hand-shaking motion from a video. Existing video stabilization algorithms [1,… (More)