Table 3 Responses to statements included in the Definition of Big Data domain
From: A Delphi study to build consensus on the definition and use of big data in obesity research
Big Data…. | Round 1 (n = 36) | Round 2 (n = 29) | Round 3 (n = 26) | |||
|---|---|---|---|---|---|---|
Agree % | Disagree % | Agree % | Disagree % | Agree % | Disagree % | |
1. Always has a large sample size | 77.8% | 22.2% | 75.9% | 24.1% | 88.5% | 11.5% |
2. Always requires additional computing power | 68.6% | 31.4% | 69.0% | 31.0% | 80.8% | 19.2% |
3. Is never collected for research purposes (i.e. there is no a priori research question) | 25.7% | 74.3% | 21.4% | 78.6% | 15.4% | 84.6% |
4. Is always observational | 40.0% | 60.0% | 22.2% | 77.8% | 23.1% | 76.9% |
5. Does not require specialist mathematical or data science analytical skills | 12.1% | 87.9% | 7.1% | 92.9% | 8.0% | 92.0% |
6. Does not require specialist knowledge of database management | 15.6% | 84.4% | 14.8% | 85.2% | 12.5% | 87.5% |
7. Does not require knowledge of computer programming | 42.4% | 57.6% | 37.0% | 63.0% | 25.0% | 75.0% |
8. Is always digital | 61.8% | 38.2% | 66.7% | 33.3% | 72.0% | 28.0% |
9. Does not include qualitative data | 35.3% | 64.7% | 17.9% | 82.1% | 23.1% | 76.9% |
10. Includes government data sets | 94.3% | 5.7% | 96.6% | 3.4% | 96.2% | 3.8% |
11. Includes cohort data sets | 86.1% | 13.9% | 92.9% | 7.1% | 96.2% | 3.8% |
12. Includes commercial data sets | 97.2% | 2.8% | 96.6% | 3.4% | 96.2% | 3.8% |
13. Includes routine data sets | 94.4% | 5.6% | 96.6% | 3.4% | 100.0% | 0.0% |
14. Always includes more than one data set | 16.7% | 83.3% | 17.2% | 82.8% | 15.4% | 84.6% |
15. Big data always has at least one of: • large volume (e.g. in terms of sample size, number of variables or measurement occasions), • variety (e.g. in terms of the types of variable), or • velocity (e.g. is generated at speed) | – | – | 93.1% | 6.9% | 92.3% | 7.7% |
