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Stan Math Library
5.1.0
Automatic Differentiation
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Return a vector or matrix with sum zero corresponding to the specified free input.
Return a vector with sum zero corresponding to the specified free vector.
This overload handles looping over the elements of a standard vector.
T | A standard vector with inner type that is either a vector or a matrix |
[in] | y | free vector or matrix |
The sum-to-zero transform is defined using a modified version of the inverse of the isometric log ratio transform (ILR). See: Egozcue, Juan Jose; Pawlowsky-Glahn, Vera; Mateu-Figueras, Gloria; Barcelo-Vidal, Carles (2003), "Isometric logratio transformations for compositional data analysis", Mathematical Geology, 35 (3): 279–300, doi:10.1023/A:1023818214614, S2CID 122844634
This implementation is closer to the description of the same using "pivot coordinates" in Filzmoser, P., Hron, K., Templ, M. (2018). Geometrical Properties of Compositional Data. In: Applied Compositional Data Analysis. Springer Series in Statistics. Springer, Cham. https://doi.org/10.1007/978-3-319-96422-5_3
This is a linear transform, with no Jacobian.
T | type of the vector |
y | Free vector input of dimensionality K - 1. |
Definition at line 141 of file sum_to_zero_constrain.hpp.