Table 1. Boosted beta regression covariates.
| Name | Description | Type | Level |
|---|---|---|---|
| Brand | The manufacturer of the majority of units in the project | Qualitative | Unit |
| No. of units | The number of units deployed in the project | Quantitative | Unit |
| Purchase date | Weighted mean of the year of purchase of all units in the project | Quantitative | Unit |
| Time-to-fix | Weighted mean of the maximum time units were allowed to obtain a fix | Quantitative | Unit |
| Transfer method | The transfer method used by the majority of units in the project. Levels: GSM; Satellite; Store-on-board; VHF/UHF. | Qualitative | Unit |
| Burrowing/ Hibernating | Boolean indication of burrowing and/or hibernating individuals in the project | Qualitative | Species |
| Height (log-transformed) | Natural log of the weighted mean of the species height across all individuals in the project | Quantitative | Species |
| Forest Cover (quantitative) | Mean forest cover in the study area as derived from the GlobCover dataset using the coordinates provided in the questionnaire. | Quantitative | Environment |
| Forest cover (qualitative) | Percentage of forest cover as indicated in the questionnaire. Levels: 0–25%; 26–50%; 51–75%; 76–100% | Qualitative | Environment |
| Forest type | Type of forest in the study area as indicated in the questionnaire. Levels: No forest cover; Temperate evergreen; Temperate deciduous; Temperate mixed; (Sub)Tropical evergreen; (Sub)Tropical deciduous; (Sub)Tropical mixed. | Qualitative | Environment |
| Forest density | Density of forest in the study area as indicated in the questionnaire. Levels: No forest cover; Open understory & sparse canopy cover; Dense understory & sparse canopy cover; Open understory & intermediate canopy cover; Dense understory & inter-mediate canopy cover, Open understory & closed canopy; Dense understory & closed canopy. | Qualitative | Environment |
| Terrain ruggedness | Terrain ruggedness as indicated in the questionnaire. Levels: Steep slopes and narrow valleys, flat areas and gentle slopes are rare (< 20%); Steep slopes, interspersed with flat areas and/or gentle slopes; Mostly flat area and/or gentle slopes, with occasional steep slopes (< 20%); Mostly flat area or gentle slopes (< 5% steep slopes). | Qualitative | Topography |
| Terrain Ruggedness Index | Mean Terrain Ruggedness Index across the study area, as derived from either SRTM or ASTER Digital Elevation Models for the study area. This variable was used as a proxy for available view to the sky. | Quantitative | Topography |
Covariates used for the boosted beta regression on the fix acquisition rate and overall fix success rate of satellite telemetry units.