StrataModel: Stratum model class
In r-glennie/openpopscr: Open Population Spatial Capture-Recapture

Fits the a model to different strata, sharing some parameters across strata.

scr_data: a list of ScrData objects, one per stratum
model: name of model class, e.g., ScrModel, CjsModel, JsModel
shared_form: a named list of formulae for each parameter that is shared across strata (~1 for constant)
private_form: a named list of formula for each parameter that is private to each stratum, one per stratum
print: (defualt TRUE) if TRUE then useful output is printed
args : list of other arguments to passed to $new for model object

Methods include:

get_par(...): calls get_par for each model object using arguments ... and returns list of results
calc_llk(): compute joint log-likelihood at current parameter values
fit: fit the model by obtaining the maximum likelihood estimates
par(): return current parameter of the model
mle_llk(): return log-likelihood value of maximum likelihood estimates
is_shared(par): returns indices of any named elements in par that are shared parameters across strata
is_private(par): returns indices of any named elements in par that are private parameters across strata