check.species.presence

a list with an element for each strata
which contains a vector of corresponding species codes for those
species which occur in that strata or NULL if it is to be data driven.

species.presence

a vector of species names for which model names were 
supplied in the ddf.models list passed to execute.multi.analysis by the 
user.

species.name

strata.name

Performs a number of checks to ensure the list has been defined correctly.
If no list was specified one is created assuming all species are present in 
all strata.

internal

Performs distance sampling analyses on a number of species
at once and can account for unidentified sightings, model uncertainty
and covariate uncertainty. Unidentified sightings refer to sightings
which cannot be allocated to a single species but may instead be
allocated to a group of species. The abundance of each unidentified
group is estimated and then prorated to the species estimates. Model
uncertainty should be incorporated when multiple models give equally
good fit to the data but lead to large differences in estimated
density / abundance. Covariate uncertainty should be incorporated
when covariates cannot be measured accurately, for example this is
often the case for group size in marine mammal surveys. Variance
estimation for these methods is via a non parametric bootstrap.
The methods implemented are described in Gerodette T. and Forcada
J. (2005) <doi:10.3354/meps291001> Non-recovery of two spotted and
spinner dolphin populations in the eastern tropical Pacific Ocean.

check.species.presence: Checks the list of species presence definitions supplied by the user

Description

Usage

Arguments

Value

See Also