CRAN release 1.0.9

Distance 1.0.9

• Changed the default encounter rate estimator for point transect surveys from P3 to P2. (Issue #138)
• Fixed bug which produced NA's when stratum names came after 'Total' in the alphabet. (Issue #158)
• Added additional documentation explaining the adjustment term options when covariates are in the model. (Issue #156)
• Fixed dht bootstrap to work when distbegin and distend are supplied but not distance. (Issue #147)
• Added a warning for the dht bootstrap when Sample.Label values are not unique across all strata. (Issue #157)
• Distance 1.0.9 depends on mrds >= 2.3.0 due to re-named documentation page links.