Description Usage Format Details Source References Examples
Simulated example for occupancy model, see code below.
1 |
A data frame with 1000 observations on the following 6 variables.
Y
true occupancy
W
observations
x1
random variables used as covariates
x2
random variables used as covariates
x3
random variables used as covariates
x4
random variables used as covariates
p.occ
probability of occurrence
p.det
probability of detection
This simulated example corresponds to the ZI Binomial model implemented in the function svocc
.
Simulated example.
Lele, S.R., Moreno, M. and Bayne, E. (2011) Dealing with detection error in site occupancy surveys: What can we do with a single survey? Journal of Plant Ecology, 5(1), 22–31.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | data(datocc)
str(datocc)
## Not run:
## simulation
n <- 1000
set.seed(1234)
x1 <- runif(n, -1, 1)
x2 <- as.factor(rbinom(n, 1, 0.5))
x3 <- rnorm(n)
x4 <- rnorm(n)
beta <- c(0.6, 0.5)
theta <- c(0.4, -0.5, 0.3)
X <- model.matrix(~ x1)
Z <- model.matrix(~ x1 + x3)
mu <- drop(X %*% beta)
nu <- drop(Z %*% theta)
p.occ <- binomial("cloglog")$linkinv(mu)
p.det <- binomial("logit")$linkinv(nu)
Y <- rbinom(n, 1, p.occ)
W <- rbinom(n, 1, Y * p.det)
datocc <- data.frame(Y, W, x1, x2, x3, x4, p.occ, p.det)
## End(Not run)
|
Loading required package: Formula
Loading required package: stats4
Loading required package: pbapply
detect 0.4-2 2018-08-29
'data.frame': 1000 obs. of 8 variables:
$ Y : num 1 1 1 1 1 1 0 0 0 1 ...
$ W : num 1 0 0 0 1 1 0 0 0 1 ...
$ x1 : num -0.773 0.245 0.219 0.247 0.722 ...
$ x2 : Factor w/ 2 levels "0","1": 2 1 1 1 2 1 1 1 2 2 ...
$ x3 : num -1.205 0.301 -1.539 0.635 0.703 ...
$ x4 : num -0.9738 -0.0996 -0.1107 1.1922 -1.6559 ...
$ p.occ: num 0.71 0.872 0.869 0.873 0.927 ...
$ p.det: num 0.605 0.591 0.457 0.615 0.562 ...
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