Table 6.

Evaluation methods

Evaluation method	Citation
MAE, Precision, Recall, RMSE	Dwivedi and Bharadwaj (2015), Bourkoukou and El Bachari (2016), Bourkoukou et al.(2016), Tarus et al.(2017), Bourkoukou et al.(2017), Tarus et al.,(2018a, 2018b), Albatayneh et al. (2018), Klašnja-Milićević et al., (2018a, 2018b), Xiao et al. (2018), Deng et al. (2018), Zhang et al. (2019), Bhaskaran and Santhi (2019), Nafea et al. (2019), Riyahi and Sohrabi (2020), Ibrahim et al. (2020), Venkatesh and Sathyalakshmi (2020), Jagadeesan and Subbiah (2020, Murad et al. (2020), Anuradha et al. (2020), and Nabizadeh et al. (2020)
Learner Score	Senthilnayaki et al. (2015), Wan and Niu (2016), Benhamdi et al. (2017), Christudas et al. (2018), Wan and Niu (2018), Dwivedi et al., (2018, Aeiad and Meziane (2019), Segal et al. (2019), Vanitha and Krishnan (2019), Sarwar et al. (2019), Jagadeesan and Subbiah (2020), Hwang et al.(2020a), and Nabizadeh et al. (2020)
Usage of LO	Wan and Niu (2016) and Wan and Niu (2018)
Run Time	Bourkoukou and El Bachari (2016), Christudas et al. (2018), Klašnja-Milićević et al., (2018a, 2018b), and Bhaskaran and Santhi (2019)
Learner Satisfaction	Tarus et al. (2017), Zhu (2018) Christudas et al.(2018), Wan and Niu (2018), Rahman and Abdullah (2018), Klašnja-Milićević et al., (2018a, 2018b), Nafea et al. (2019), Kouis et al. (2020), Shi et al. (2020), and Nabizadeh et al. (2020)
Learning Time	Wan and Niu (2018)