Description Usage Value Details Note Author(s)
Given distance sampling survey data in flatfile format, convert it to the four tables required by dht
.
1 |
list of the four data.frame
s described in "Details".
region.table data.frame
with two columns: Region.Label
, label for the region; Area
, area of the region. region.table
has one row for each stratum. If there is no stratification then region.table
has one entry with Area
corresponding to the total survey area.
sample.table data.frame
mapping the regions to the samples (i.e. transects). There are three columns: Sample.Label
, label for the sample; Region.Label
, label for the region that the sample belongs to.; Effort
, the effort expended in that sample (e.g. transect length).
obs.table data.frame
mapping the individual observations (objects) to regions and samples. There should be three columns: object
, the observation ID; Region.Label
, label for the region that the sample belongs to; Sample.Label
, label for the sample.
data a data.frame
containing at least a column called distance
. NOTE! If there is a column called size
in the data then it will be interpreted as group/cluster size.
Based on checkdata
from package Distance
.
David L. Miller
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