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Finally, the authors provide algorithms for ranking the knowledge units with objective and subjective difficulty scores. The experiment on the knowledge map of the \u201cplane geometry\u201d course shows that our algorithm can precisely calculate the difficulty level of knowledge units.<\/p>","DOI":"10.4018\/jdet.2012010102","type":"journal-article","created":{"date-parts":[[2012,1,13]],"date-time":"2012-01-13T13:48:25Z","timestamp":1326462505000},"page":"31-43","source":"Crossref","is-referenced-by-count":2,"title":["Ranking the Difficulty Level of the Knowledge Units Based on Learning Dependency"],"prefix":"10.4018","volume":"10","author":[{"given":"Jun","family":"Liu","sequence":"first","affiliation":[{"name":"Xi\u2019an Jiaotong University, China"}]},{"given":"Sha","family":"Sha","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University, China"}]},{"given":"Qinghua","family":"Zheng","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University, China"}]},{"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Microsoft, USA"}]}],"member":"2432","reference":[{"key":"jdet.2012010102-0","doi-asserted-by":"publisher","DOI":"10.1109\/TKDE.2005.99"},{"key":"jdet.2012010102-1","doi-asserted-by":"publisher","DOI":"10.1016\/0950-5849(95)91491-H"},{"key":"jdet.2012010102-2","year":"2008","journal-title":"Correlation and the Pearson\u2019s correlation coefficient: Learning skills"},{"key":"jdet.2012010102-3","doi-asserted-by":"publisher","DOI":"10.1016\/S0950-7051(00)00048-4"},{"key":"jdet.2012010102-4","doi-asserted-by":"crossref","unstructured":"Han, H. 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