Page 15 - R_EdQuire White Paper Nov 2017 v3.4

EdQuire White Paper: Computer learning behaviour in K-12
Nov 2017 V3.4
Page 15 of 15

Appendix 1 - DI Formula
DI formula is;
p(on_task) = t(on_task) / (t(on_task) + t(off_task))
p(off_task) = t(off_task) / (t(on_task) + t(off_task))
DI_odds = p(on task)/(p(off task) x number of switch)
DI = 1 - (DI_odds/(1+DI_odds))

For example: Student A spends 8 minutes On task and 2 minutes Off task, and switched between these Tasks
on 5 occasions. Then DI_odds = 0.8/(0.2*5) = 0.8 and DI = 1-(0.8/1.8)=0.56, resulting in Student A’s DI of 0.56.
Alternatively, if Student A switched 10 times (instead of 5) the DI will increase to 0.71, resulting in a greater
number and therefore an increase in distractibility. The Distractibility Index is measured on a range between
0 and 1. Based on our research, a value of 0.8 indicates that student is easily distractible, while 0 means the
student is predominantly On-Task.

References
Kraushaar, J., & Novak, D. (2010). Examining the Effects of Student Multitasking With Laptops During the
Lecture. Journal of Information Systems Education, 21(2), 241-251.

Crook, S., Sharma, M. Bloom-ing Heck! The Activities of Australian Science Teachers and Students Two Years
into a 1:1 Laptop Program Across 14 High Schools. International Journal of Innovation in Science and
Mathematics Education, 21(1), 54-69, 2013.

NAP-ICT 2014. Fraillon, Julian; Schulz, Wolfram; Gebhardt, Eveline; and Ainley, John, (2015)."National
Assessment Program : ICT Literacy Years 6 & 10 Report 2014" Sydney: Australian Curriculum, Assessment and
Reporting Authority (ACARA) http://research.acer.edu.au/ict_literacy/11

White, R & Huang, J. Assessing the scenic route: Measuring the value of search trails in web logs. SIGIR’10,
July 19–23, 2010.

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