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Estimates Hessian of a scalarvalued function, and returns it in a sparse Matrix format. The sparsity pattern must be known in advance. The algorithm is especially efficient for hierarchical models with a large number of heterogeneous units. See Braun, M. (2017) <doi:10.18637/jss.v082.i10>.
Package details 


Author  Michael Braun [aut, cre, cph] 
Maintainer  Michael Braun <[email protected]> 
License  MPL (== 2.0) 
Version  0.3.3.4 
URL  http://www.smu.edu/Cox/Departments/FacultyDirectory/BraunMichael 
Package repository  View on CRAN 
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