recumbent

<p>The recumbent dataset contains information on pregnant dairy cows that become
recumbent, i.e., they lie down shortly before or after calving for unknown reasons. This condition
can be severe and frequently leads to death of the cow. Clark, Henderson,
Hoggard, Ellison and Young (1987) analyzed data collected at the Ruakura (N.Z.)
Animal Health Laboratory on a sample of recumbent cows.</p>

datasets

The itdr() routine allows  for the estimation of sufficient dimension reduction subspaces in univariate regression such as the central mean subspace or central subspace in regression. This is achieved using Fourier transformation methods proposed by Zhu and Zeng (2006) <doi:10.1198/016214506000000140>, convolution transformation methods proposed by Zeng and Zhu (2010) <doi:10.1016/j.jmva.2009.08.004>, and iterative Hessian transformation methods proposed by Cook and Li (2002) <doi:10.1214/aos/1021379861>. Additionally, mitdr() function provides optimal estimators for sufficient dimension reduction subspaces in multivariate regression by optimizing a discrepancy function using a Fourier transform approach proposed by Weng and Yin (2022) <doi:10.5705/ss.202020.0312>, and selects the sufficient variables using Fourier transform sparse inverse regression estimators proposed by Weng (2022) <doi:10.1016/j.csda.2021.107380>.

recumbent: Recumbent Cows

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