This function fits an occupancy model to simulated detection histories using the package unmarked for species that are detected using only one detection method A trend in occupancy is estimated from the simulated detection histories. Confidence intervals are calculated depending on the Type I error rate. A one-tailed or two-tailed significance test is then conducted on the trend parameter A one-tailed test looks to see if the upper or lower confidence interval is greater than or less than zero. A two-tailed test assesses whether both the upper and lower confidence intervals have the same sign (i.e. are both positive or negative). If park.power = TRUE, model fitting is repeated on sites from within each park-level management unit.
1 2 | fit.occ.1method(method, repeats, s.years, n.sites, xy.sites, park.ID,
park.level, powcnt, fail, pow.park, fail.park, value, ss, two.tailed, n.park)
|
method |
The detection method relevant to species ss |
repeats |
The number of repeat visits for the specified detection method |
s.years |
A vector specifying the years that monitoring occurs. Note, monitoring must be done in the final year (i.e. Tmax) |
n.sites |
The number of sites in which to simulate monitoring |
xy.sites |
The XY coordinates of monitored sites, plus the park site ID |
park.ID |
A vector identifying which park each site is in |
park.level |
Set to TRUE if power is estimated within park-level management unit, FALSE to estimate power only across the landscape |
powcnt |
A vector that keeps track of how many times a significant trend in occupancy is detected across the landscape |
fail |
A vector that keeps track of how many times the occupancy model could not be fitted to the simulated detection histories from all sites in the landscape |
pow.park |
A vector that keeps track of how many times a significant trend in occupancy is detected within each park |
fail.park |
A vector that keeps track of how many times the occupancy model could not be fitted to simulated detection histories generated from within each park |
value |
The critical value used to calculate confidence intervals around the trend parameter, depending on the Type I error rate and a one-tailed or two-tailed test |
ss |
An index to loop through each species |
two.tailed |
Set to TRUE if conducting a two-tailed test, FALSE to conduct a one-tailed test |
n.park |
The number of parks in which to estimate power |
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