NSM sample recruitment, feasibility of network data collection, and cost by survey mode
| . | In Person . | Telephone . | Web . |
|---|---|---|---|
| Sample Recruitment | |||
| Target sample size | 200 | 200 | 200 |
| Time in the field | March–Sept. 2018 | March–Sept. 2018 | June 2018–Jan. 2019 |
| Number of seeds | 7a | 7a | 3 |
| Number of cases assigned to interviewer/web | 274 | 291 | 159 |
| Number of completed interviews (including seeds) | 199 | 202 | 81 |
| Number of partial interviews | 0 | 0 | 2 |
| Feasibility of Network Data Collection | |||
| Mean number of ties nominated in Roster Ab | 4.6 (1.8) | 3.7 (2.2) | 3.1 (3.0) |
| Mean number of ties referred in Roster Ab | 4.3 (1.9) | 3.4 (2.2) | 1.7 (2.6) |
| Mean number of ties nominated in Roster Bb | 2.9 (0.5) | 2.7 (0.8) | 1.5 (1.5) |
| Mean number of ties nominated in Roster Cb | 2.9 (0.4) | 2.7 (0.8) | 1.5 (1.5) |
| Cost per Valid Interview ($)c | 177.00 | 130.66 | 84.05 |
| . | In Person . | Telephone . | Web . |
|---|---|---|---|
| Sample Recruitment | |||
| Target sample size | 200 | 200 | 200 |
| Time in the field | March–Sept. 2018 | March–Sept. 2018 | June 2018–Jan. 2019 |
| Number of seeds | 7a | 7a | 3 |
| Number of cases assigned to interviewer/web | 274 | 291 | 159 |
| Number of completed interviews (including seeds) | 199 | 202 | 81 |
| Number of partial interviews | 0 | 0 | 2 |
| Feasibility of Network Data Collection | |||
| Mean number of ties nominated in Roster Ab | 4.6 (1.8) | 3.7 (2.2) | 3.1 (3.0) |
| Mean number of ties referred in Roster Ab | 4.3 (1.9) | 3.4 (2.2) | 1.7 (2.6) |
| Mean number of ties nominated in Roster Bb | 2.9 (0.5) | 2.7 (0.8) | 1.5 (1.5) |
| Mean number of ties nominated in Roster Cb | 2.9 (0.4) | 2.7 (0.8) | 1.5 (1.5) |
| Cost per Valid Interview ($)c | 177.00 | 130.66 | 84.05 |
Note: Standard deviations are shown in parentheses.
Seeds for the in-person and telephone samples were shared across the two modes.
The target for the number of nominated and referred ties per respondent for Rosters A, B, and C was 6, 3, and 3, respectively.
Survey cost calculations include hourly labor costs of interviewers and the web survey manager, transportation costs for in-person interviews, monetary incentives for all interview modes, and programming costs of the Qualtrics survey applied equally to each interview mode.