Table 3 Descriptive statistics of features
From: Developing an early-warning system for spotting at-risk students by using eBook interaction logs
Features | High Performers (n = 45) | Low Performers (n = 45) | t Test | ||
|---|---|---|---|---|---|
mean | SD | mean | SD | t-value | |
contentcount | 9.33 | 3.84 | 5.2 | 5.15 | t = 4.31 (p < 0.001) |
sessioncount | 11.62 | 5.82 | 4.73 | 4.83 | t = 6.11 (p < 0.001) |
totaltime | 320 | 288 | 93.44 | 109 | t = 4.92 (p < 0.001) |
totalevent | 1068 | 1093 | 441 | 607 | t = 3.36 (p < 0.01) |
uniqueweek | 6.24 | 2.47 | 2.58 | 2.58 | t = 6.88 (p < 0.001) |
uniqueday | 7.44 | 3.30 | 3.02 | 2.97 | t = 6.68 (p < 0.001) |
completionrate | 67.13 | 24.77 | 40.84 | 34.69 | t = 4.13 (p < 0.001) |
longevent | 328 | 330 | 130 | 172 | t = 3.57 (p < 0.001) |
shortevent | 739 | 789 | 311 | 456 | t = 3.15 (p < 0.01) |
next | 719 | 694 | 307 | 425 | t = 3.39 (p < 0.01) |
prev | 272 | 305 | 105 | 155 | t = 3.26 (p < 0.01) |
open | 32.67 | 26.38 | 14.47 | 17.03 | t = 3.88 (p < 0.001) |
jump* | 8.93 | 17.29 | 1.51 | 4.19 | t = 2.79 (p < 0.01) |
marker* | 2.36 | 4.28 | 0.6 | 2.09 | t = 2.47 (p < 0.05) |
memo* | 8.91 | 42.32 | 0.33 | 1.55 | t = 1.36 (p < 0.5) |
bookmark* | 0.44 | 0.72 | 3.42 | 15.26 | t = −1.3 (p < 0.5) |
score | 84.58 | 11.25 | 47.71 | 19.72 | t = 10.8 (p < 0.001) |