Table 5.
Comparison of profile and query reformulation actions between resource-based and task-based systems
| Next Profile Action + Next Query Reformulation Action | Resource-based (n=1398) N (%) (95% CI) |
Task-based (n=585) N (%) (95% CI) |
Z | P |
| Same profile + no change | 67 (4.8%) (3.79-6.04) |
74 (12.6%) (10.20-15.59) |
–5.28 | <.001 |
| Same profile + syntactic changes only | 193 (13.8%) (12.10-15.71) |
99 (16.9%) (14.10-20.18) |
–1.73 | .08 |
| Same profile + semantic changes only | 203 (14.5%) (12.77-16.46) |
123 (21.0%) (17.92-24.51) |
–3.37 | <.001 |
| Same profile + syntactic and semantic | 94 (6.7%) (5.53-8.16) |
83 (14.2%) (11.59-17.25) |
–4.69 | <.001 |
| Previous profile + no change | 120 (8.6%) (7.23-10.17) |
16 (2.7%) (1.69-4.40) |
5.80 | <.001 |
| Previous profile + syntactic changes only | 18 (1.3%) (0.82-2.03) |
10 (1.7%) (0.93-3.12) |
–0.69 | .49 |
| Previous profile + semantic changes only | 36 (2.6%) (1.87-3.54) |
17 (2.9%) (1.82-4.60) |
–0.41 | .68 |
| Previous profile + syntactic and semantic | 28 (2.0%) (1.39-2.88) |
12 (2.1%) (1.18-3.55) |
–0.07 | .94 |
| New profile + no change | 401 (28.7%) (26.37-31.11) |
54 (9.2%) (7.14-11.85) |
11.43 | <.001 |
| New profile + syntactic changes only | 83 (5.9%) (4.81-7.30) |
28 (4.8%) (3.33-6.83) |
1.06 | .29 |
| New profile + semantic changes only | 87 (6.2%) (5.07-7.61) |
39 (6.7%) (4.91-8.98) |
–0.36 | .72 |
| New profile + syntactic and semantic | 68 (4.9%) (3.85-6.12) |
30 (5.1%) (3.62-7.23) |
–0.24 | .81 |