Systematic_variance_1: Simulation of encounter rate variance

Description Format Details Note References


Simulated line transect data with large differences in transect length. In systematic_var_2 that transect length gradient is coupled with a strong animal gradient; exaggerating encounter rate variance between transects.


data.frame with 253 observations of 7 variables:

Region.Label stratum label (default)
Area stratum area (0.5 km^2)
Sample.Label transect identifier
Effort transect length (km)
object object ID
distance perpendicular distance (m)
Study.Area name of study area


True population size is 1000 objects in the study area of size 0.5 km^2; such that true density is 2000 objects per km.


Data structure for systematic_var_2 is identical, but there are 256 observations and a strong animal gradient.


Fewster, R.M., S.T. Buckland, K.P. Burnham, D.L. Borchers, P.E. Jupp, J.L. Laake and L. Thomas. (2009) Estimating the encounter rate variance in distance sampling. Biometrics 65 (1): 225–236.

Distance documentation built on Jan. 13, 2021, 10:43 p.m.