Point and interval statistical performances of Morisita patchiness index estimators in different sampling schemes: simulated data
收藏Mendeley Data2024-01-31 更新2024-06-26 收录
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This dataset comprises 1,440,000 lines according to different simulated scenarios of varying fragment shape, sampling unit shape and size, aggregation effect, edge effect and sampling effort. The variables (columns) are: rep (replication number of a scenario), sampling (A: hexagonal lattice sampling, B: quadrat lattice sampling, C: circlet lattice sampling, D: east-to-west transect sampling, E: south-to-north transect sampling), spptype (type of point process: either 'poisson' for complete spatial randomness or 'thomas' for modified Thomas process), agg (gaussian radius of the modified Thomas process; 0: no aggregation, i.e., spptype=='poisson', 1: 0.04 radius, 2: 0.02 radius, 3: 0.01 radius), ftype (either convex or square shape for the fragment), quad.side (area of the sampling units; S: small- each sampling unit with 1x10-4 area; M: medium- each sampling unit with 4x10-4 area, B: big- each sampling unit with 1.6x10-3 area), sample.area (sampling effort; ss: small- 1% of the total area of the fragment, ms: medium- 5% of the total area, bs: big- 10% of the total area), dens (population density- constant in Hausdorff distance), affty (affinity for core area; 0: equal preference for edge and core area; 1-4: increasing edge avoidance), frag.area (total area of the fragment), n.points (number of points generated in the point process), in.points (number of points within all sampling units of a given shape), Id (populational Morisita patchiness index), Id.hat (MLE of Id), Id.jackk (jackknife estimator of Id), V.jackk (jackknife variance estimate of Id-- this was calulated wrong!), Id.boot (boostrap estimate of Id), V.boot (boostrap variance estimate of Id), P025.boot (2.5 bootstrap percentile), P975.boot (97.5 bootstrap percentile).
创建时间:
2024-01-31



