Abstract
Unobservable stages are common in many life cycles. Estimates of the vital rates, such as survival and breeding probabilities, of these stages are essential for demographic analysis but difficult to obtain. Explicit modeling of these states in multi-state mark-recapture methods can provide such estimates. However, models can be rank-deficient, meaning that not all parameters can be estimated. Determining whether a model is full rank is essential for interpretation of model selection and estimation results. Full rank models can be obtained by imposing biologically reasonable constraints on parameters. Developing such models requires an efficient way to assess model rank and determine which parameters, if any, are redundant. We introduce the use of automatic differentiation (AD) for this purpose. It generates the Jacobian matrix of the likelihood function in a way that is numerically stable, can accommodate large complicated models, and produces rank estimates accurate to machine precision. It reveals whether a model is full rank or rank-deficient (either intrinsically or for a particular data set), how many parameters or parameter combinations can be estimated, and which parameters are confounded. We use the method to explore three examples relevant to seabirds: a model with multiple breeding sites, a model distinguishing successful and failed breeders, and a model for pre-breeder survival and recruitment. We find a surprisingly large number of time-invariant and time-varying models to be of full rank, thus allowing estimation of all parameters, despite the unobservable states. We present a biological example for the Wandering Albatross (Diomedea exulans). Reliable assessment of model rank for multi-state mark-recapture models with unobservable stages will make it possible to use these methods in demographic applications.
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Notes
- 1.
In sufficiently simple models, including extra information on capture probabilities obtained using Pollock’s robust design can sometimes resolve parameter redundancy (Kendall et al. 1997; Kendall and Nichols 2002). However, when the unobservable states are more richly structured, merely knowing capture probabilities in the observable states will generally not solve the problem.
- 2.
Murota states this result for matrices whose entries are rational functions of the parameters, so it would apply directly to Jacobians calculated in terms of the probabilities (the identity link) rather than the logit transform of the probabilities. When calculated using the logit link, the entries of \({\bf J}\) are analytic, but not rational, functions of \({\boldsymbol \theta}\). However, analytic functions are given everywhere by their Taylor series, so the result applies equally to the logit link case (M. Golubitsky personal communication).
- 3.
Note that this same argument is used independently by Rouan et al. (unpublished).
- 4.
The number is slightly less than a simple combinatorial calculation would suggest because some possibilities (e.g., all \(\sigma_i\) equal, with additive time variation) are not possible.
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Hunter, C.M., Caswell, H. (2009). Rank and Redundancy of Multistate Mark-Recapture Models for Seabird Populations with Unobservable States. In: Thomson, D.L., Cooch, E.G., Conroy, M.J. (eds) Modeling Demographic Processes In Marked Populations. Environmental and Ecological Statistics, vol 3. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-78151-8_37
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