### Abstract

Partial least squares (PLS) was first introduced byWold in the mid 1960s as a heuristic algorithm to solve linear least squares (LS) problems. No optimality property of the algorithm was known then. Since then, however, a number of interesting properties have been established about the PLS algorithm for regression analysis (called PLS1). This paper shows that the PLS estimator for a specific dimensionality S is a kind of constrained LS estimator confined to a Krylov subspace of dimensionality S. Links to the Lanczos bidiagonalization and conjugate gradient methods are also discussed from a somewhat different perspective from previous authors.

Original language | English |
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Title of host publication | The Multiple Facets of Partial Least Squares and Related Methods |

Publisher | Springer |

Pages | 17-28 |

Number of pages | 12 |

ISBN (Electronic) | 9783319406435 |

ISBN (Print) | 9783319406411 |

DOIs | |

Publication status | Published - 16 Oct 2016 |

### Publication series

Name | Springer Proceedings in Mathematics & Statistics |
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Publisher | Springer |

Volume | 173 |

ISSN (Print) | 2194-1009 |

ISSN (Electronic) | 2194-1017 |

### Keywords

- Conjugate gradients
- Constrained principal component analysis (CPCA)
- Krylov subspace
- Lanczos bidiagonalization
- NIPALS
- PLS1 algorithm

### ASJC Scopus subject areas

- Mathematics(all)

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## Cite this

*The Multiple Facets of Partial Least Squares and Related Methods*(pp. 17-28). (Springer Proceedings in Mathematics & Statistics; Vol. 173). Springer. https://doi.org/10.1007/978-3-319-40643-5_2