was determined as a training data taken from the courses of Informatics during the years 2010–11 and 2011–12 (74 rows). The second group of data sets was determined as predictable data taken from the courses of Informatics during the years 2012–13 (32 rows, without predictable ‘‘Final grade’’ column). In these courses, there 106 students who were included in the research (rows) participated. Regarding the Informatics 2012–13 course the actual ‘‘Final grade’’ was available for testing the results (32 row of actual ‘‘Final grade’’ data). The described data set from small number of examples but their content was estimated to be relevant for
machine learning (Han, Kamber, & Pei, 2012).