ENiRG (version 1.0.1)

cbi.results: List with values returned from boyce.

Description

cbi.results is a list which stores output of the continuous Boyce classification performed with boyce.

Usage

data(cbi.results)

Details

Source dataset refers to classification of the niche analysis performed on apis.enirg data.

References

Boyce, M.S.,Vernier, P.R.,Nielsen,S.E.,Schmiegelow, F.K.A. (2002). Evaluating resource selection functions. Ecological Modelling 157, 281-300.

Fielding, A., Bell, J. (1997). A review of methods for the assessment of prediction errors in conservation presence/absence models. Environmental Conservation, 24, 38-49.

Hirzel, A.H., Le Lay, G., Helfer, V., Randin, C., Guisan, A. (2006). Evaluating the ability of the habitat suitability models to predict species presences. Ecological Modelling 199, 142-152.

Examples

data(apis.hsm)

# vector of predictions for observations:
apis.predictions <- apis.hsm$predictions[, 2]

# vector of predictions for the entire predicted map:
apis.predictions.map <- as.vector(na.exclude(apis.hsm$African_predicted_hsm@data@values))

# Try with intervals:
# unsuitable = 0.65
# marginal = 0.84
# suitable = 0.96
# Note that this species has an optimal distribution
# in the study area, resulting in a wide unsuitable
# interval and narrow suitable ones.

boyce(prediction = apis.predictions,
      prediction.map = apis.predictions.map,
      categories = c(0, 0.65, 0.84, 0.96, 1),
      cv.sets = 10, type = "none")
      
data(cbi.results)
cbi.results