A collection of all the estimation functions for spatial cross-sectional
models (on lattice/areal data using spatial weights matrices) contained
up to now in 'spdep', 'sphet' and 'spse'. These model fitting functions
include maximum likelihood methods for cross-sectional models proposed
by 'Cliff' and 'Ord' (1973, ISBN:0850860369) and (1981,
ISBN:0850860814), fitting methods initially described by 'Ord' (1975)
<doi:10.1080/01621459.1975.10480272>. The models are further described
by 'Anselin' (1988) <doi:10.1007/978-94-015-7799-1>. Spatial two stage
least squares and spatial general method of moment models initially
proposed by 'Kelejian' and 'Prucha' (1998) <doi:10.1023/A:1007707430416>
and (1999) <doi:10.1111/1468-2354.00027> are provided. Impact methods
and MCMC fitting methods proposed by 'LeSage' and 'Pace' (2009)
<doi:10.1201/9781420064254> are implemented for the family of cross-
sectional spatial regression models. Methods for fitting the log
determinant term in maximum likelihood and MCMC fitting are compared by
'Bivand et al.' (2013) <doi:10.1111/gean.12008>, and model fitting
methods by 'Bivand' and 'Piras' (2015) <doi:10.18637/jss.v063.i18>; both
of these articles include extensive lists of references. 'spatialreg' >=
1.1-* correspond to 'spdep' >= 1.1-1, in which the model fitting
functions are deprecated and pass through to 'spatialreg', but will mask
those in 'spatialreg'. From versions 1.2-*, the functions will be made
defunct in 'spdep'.
