descriptive | R Documentation |
This function produces descriptive statistics for capture-recapture data.
descriptive(X, dfreq=FALSE, dtype=c("hist","nbcap"), t=NULL) ## S3 method for class 'descriptive' print(x, ...) ## S3 method for class 'descriptive' plot(x, main="Exploratory Heterogeneity Graph", ...)
X |
The matrix of the observed capture histories (see |
dfreq |
A logical. By default FALSE, which means that |
dtype |
A characters string, either "hist" or "nbcap", to specify the type of data. "hist", the default, means that
|
t |
Requested only if |
x |
An object, produced by the |
main |
A main title for the plot |
... |
Further arguments to be passed to methods (see |
The plot.descriptive
function produces an exploratory heterogeneity graph.
In the absence of heterogeneity, the relation(s) presented in the graph should be almost linear.
Convex functions indicate heterogeneity (Baillargeon and Rivest (2007)).
n |
The total number of captured units. |
base.freq |
A table of basic descriptive statistics. For i=1,…,t : |
m.array |
Only if |
call |
The function call (object of class "call"). |
Louis-Paul Rivest Louis-Paul.Rivest@mat.ulaval.ca and Sophie Baillargeon
Baillargeon, S. and Rivest, L.P. (2007) Rcapture: Loglinear models for capture-recapture in R. Journal of Statistical Software, 19(5), doi: 10.18637/jss.v019.i05.
Choquet, R., Reboulet, A.M., Pradel, R., Gimenez, O. and Lebreton, J.D. (2004). M-Surge: New Software Specifically Designed for Multistate Capture-Recapture Models. Animal Biodiversity and Conservation, 27.1, 207–215.
Hoaglin, D. C. (1980) A Poissonness Plot, The American Statistician, 34, 146–149
Lindsay, B. G. (1986) Exponential family mixture models (with least-squares estimators). Annals of Statistics, 14, 124–137.
Rivest, L.P. (2008) Why a time effect often has a limited impact on capture-recapture estimates in closed populations. Canadian Journal of Statistics, 36(1), 75–84.
White, G. and Burnham, K.P. (1999) Program Mark: Survival Estimation from Populations of Marked Animals. Bird Study, 46 (Supplement), 120–138. The software can be downloaded here: http://www.phidot.org/software/mark/.
# hare data set hare.desc <- descriptive(hare) hare.desc plot(hare.desc) # cbird data set cbird.desc1 <- descriptive(cbird, dfreq = TRUE, dtype = "nbcap", t = 11) plot(cbird.desc1) # To illustrate the option t = Inf. cbird.desc2 <- descriptive(cbird, dfreq = TRUE, dtype = "nbcap", t = Inf) plot(cbird.desc2) # The y coordinate has changed.
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