Non-spatial open-population estimates using the conventional closed-form Jolly--Seber estimators (Pollock et al. 1990).
Usage
JS.direct(object)
Value
A dataframe in which the first 5 columns are summary statistics (counts from JS.counts) and the remaining columns are estimates:
p
capture probability
N
population size
phi
probability of survival to next sample time
B
number of recruits at next sample time
Standard errors are in fields prefixed `se'; for N and B these include only sampling variation and omit population stochasticity. The covariance of successive phi-hat is in the field `covphi'.
Arguments
object
secr capthist object or similar
Details
Estimates are the session-specific Jolly-Seber estimates with no constraints.
The reported SE of births (B) differ slightly from those in Pollock et al. (1990), and may be in error.
References
Pollock, K. H., Nichols, J. D., Brownie, C. and Hines, J. E. (1990) Statistical inference for capture--recapture experiments. Wildlife Monographs107. 97pp.