wiqid (version 0.3.3)

GrandSkinks: Multi-season detection data for grand skinks

Description

Results of an occupancy survey of 352 rocky outcrops ("tors") looking for grand skinks. Tors were surveyed up to 3 times per year for 5 years. The surrounding terrain was characterised as natural grassland or pasture.

Usage

data(GrandSkinks)

Format

A data frame with 352 observations on the following 16 variables.

A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3, E1, E2, E3

an array of observations of detection (1) or nondetection (0) of skinks for each of 3 occasions in 5 years. NA indicates occasions when a tor was not visited.

habitat

a factor indicating the type of grassland surrounding the tor.

Details

The data are provided as a data frame, such as would result from reading in data from a text file. Further formatting is needed before using these for analysis: see the examples.

References

MacKenzie, D I; J D Nichols; A J Royle; K H Pollock; L L Bailey; J E Hines 2006. Occupancy Estimation and Modeling : Inferring Patterns and Dynamics of Species Occurrence. Elsevier Publishing.

Examples

data(GrandSkinks)

# Extract detection histories:
DH <- GrandSkinks[, 1:15]
occMS0(DH, 3)