ALMEDA MV, 2018, ONLINE LEARN, V22, P1, DOI 10.24059/OLJ.V22I1.1060;ALTRABSHEH N, 2014, PROC INT C TOOLS ART, P419, DOI 10.1109/ICTAI.2014.70;BAKER RYAN SJD, 2009, J ED DATA MINING, V1, P3, DOI DOI 10.1109/ASE.2003.1240314;BO PANG, 2008, FOUNDATIONS AND TRENDS IN INFORMATION RETRIEVAL, V2, P1, DOI 10.1561/1500000001;BREIMAN L, 2001, MACH LEARN, V45, P5, DOI 10.1023/A:1010933404324;LINAN LC, 2015, RUSC-UNIV KNOWL SOC, V12, P98, DOI 10.7238/RUSC.V12I3.2515;CEREZO R, 2016, COMPUT EDUC, V96, P42, DOI 10.1016/J.COMPEDU.2016.02.006;CHAPLOT D.S., 2015, WORK 17 INT C ART IN, V53, P54;CUMMINS S, 2010, USING FEEDBACK TAGS, P653;D'ANDREA A., 2015, INT J COMPUT APPL, V125, P26, DOI DOI 10.5120/IJCA2015905866;D'SOUZA KA, 2017, DECIS SCI-J INNOV ED, V15, P370, DOI 10.1111/DSJI.12140;DALZIEL J., 2003, P 20 ANN C AUSTR SOC;DULUDE E, 2018, CAN J EDUC ADM POLIC, P2;FERGUSON R, 2012, INT J TECHNOL ENHANC, V4, P304, DOI 10.1504/IJTEL.2012.051816;FRIEDMAN J, 2000, ANN STAT, V28, P337, DOI 10.1214/AOS/1016218223;GANDOMI A, 2015, INT J INFORM MANAGE, V35, P137, DOI 10.1016/J.IJINFOMGT.2014.10.007;GARDNER J, 2018, USER MODEL USER-ADAP, V28, P127, DOI 10.1007/S11257-018-9203-Z;GKONTZIS AF, 2018, MEASURING ENGAGEMENT, P1;GKONTZIS AF, 2017, SENTIMENT ANAL TRACK, P39;GKONTZIS A, 2019, INTERACT LEARN ENVIR, DOI 10.1080/10494820.2019.1674884;HATZIVASSILOGLOU V, 1997, 35TH ANNUAL MEETING OF THE ASSOCIATION FOR COMPUTATIONAL LINGUISTICS AND THE 8TH CONFERENCE OF THE EUROPEAN CHAPTER OF THE ASSOCIATION FOR COMPUTATIONAL LINGUISTICS, PROCEEDINGS OF THE CONFERENCE, P174, DOI 10.3115/976909.979640;HONE KS, 2016, COMPUT EDUC, V98, P157, DOI 10.1016/J.COMPEDU.2016.03.016;HU MQ, 2004, PROCEEDING OF THE NINETEENTH NATIONAL CONFERENCE ON ARTIFICIAL INTELLIGENCE AND THE SIXTEENTH CONFERENCE ON INNOVATIVE APPLICATIONS OF ARTIFICIAL INTELLIGENCE, P755;JOCKERS M., 2020, SYUZHET: EXTRACTS SENTIMENT AND SENTIMENT-DERIVED PLOT ARCS FROM TEXT;KAGKLIS V., 2015, EUROPEAN J OPEN DIST, V18, P74, DOI 10.1515/EURODL-2015-0014, DOI 10.1515/EURODL-2015-0014;KALLES D, 2008, INTELLIGENTLY RAISIN, P37;KEERTHI SS, 2001, NEURAL COMPUT, V13, P637, DOI 10.1162/089976601300014493;KOSTOPOULOS G, 2015, LECT NOTES COMPUT SC, V9344, P259, DOI 10.1007/978-3-319-23781-7_21;KOTSIANTIS S, 2013, INT J TECHNOL ENHANC, V5, P133, DOI 10.1504/IJTEL.2013.059088;LEE J. I., 2012, P 5 INT C ED DAT MIN, P118;LIU B, 2011, DATA CENTRIC SYST AP, P459, DOI 10.1007/978-3-642-19460-3_11;LOTSARI E, 2014, LECT NOTES ARTIF INT, V8445, P300, DOI 10.1007/978-3-319-07064-3_24;MANNING CD, 2014, PROCEEDINGS OF 52ND ANNUAL MEETING OF THE ASSOCIATION FOR COMPUTATIONAL LINGUISTICS: SYSTEM DEMONSTRATIONS, P55, DOI 10.3115/V1/P14-5010;MCCOWAN T, 2017, OXFORD REV EDUC, V43, P733, DOI 10.1080/03054985.2017.1343712;NAKAYAMA M, 2017, INT J EDUC TECHNOL H, V14, DOI 10.1186/S41239-017-0048-Z;PROLLOCHS N, 2018, PLOS ONE, V13, DOI 10.1371/JOURNAL.PONE.0209323;RANI S, 2017, COMPUTER, V50, P36, DOI 10.1109/MC.2017.133;ROMERO C, 2010, HDB ED DATA MINING;ROMERO C, 2010, IEEE T SYST MAN CY C, V40, P601, DOI 10.1109/TSMCC.2010.2053532;RYAN T, 2018, ASSESS EVAL HIGH EDU, V43, P880, DOI 10.1080/02602938.2017.1416456;PANIAGUA ASE, 2018, J INTERACT MEDIA EDU, DOI 10.5334/JIME.470;SCHNELLER C, 2014, DISTANCE ED EUROPEAN;SHELTON BE, 2017, DISTANCE EDUC, V38, P59, DOI 10.1080/01587919.2017.1299562;SIEMENS G., 2005, INT J INSTR TECHNOL, V1, P3, DOI DOI 10.3109/0142159X.2016.1173661;SMOLA AJ, 1998, NEUROCOLT2 TECHNICAL;SOCHER, 2013, EMNLP, P1631, DOI DOI 10.1371/JOURNAL.PONE.0073791;STRANG KD, 2017, EDUC INF TECHNOL, V22, P917, DOI 10.1007/S10639-016-9464-2;UMER R., 2017, J RES INNOVATIVE TEA, V10, P160, DOI DOI 10.1108/JRIT-09-2017-0022;VALIENTE C, 2012, CHILD DEV PERSPECT, V6, P129, DOI 10.1111/J.1750-8606.2011.00192.X;VARGHESE RAISA, 2013, INT J RES ENG TECHNO, V2, P312;VIBERG O, 2018, COMPUT HUM BEHAV, V89, P98, DOI 10.1016/J.CHB.2018.07.027;WANG L, 2018, SUSTAINABILITY-BASEL, V10, DOI 10.3390/SU10061921;WELLER M, 2018, OPEN PRAX, V10, P109, DOI 10.5944/OPENPRAXIS.10.2.822;WILLMOTT CJ, 2005, CLIMATE RES, V30, P79, DOI 10.3354/CR030079;WU XD, 2008, KNOWL INF SYST, V14, P1, DOI 10.1007/S10115-007-0114-2;XENOS M, 2004, COMPUT EDUC, V43, P345, DOI 10.1016/J.COMPEDU.2003.09.005;YADOLLAHI A, 2017, ACM COMPUT SURV, V50, DOI 10.1145/3057270;YOU JW, 2016, INTERNET HIGH EDUC, V29, P23, DOI 10.1016/J.IHEDUC.2015.11.003;YU LC, 2018, J COMPUT ASSIST LEAR, V34, P358, DOI 10.1111/JCAL.12247