A regression framework for response variables which are continuous self-rating scales such as the Visual Analog Scale (VAS) used in pain assessment, or the Linear Analog Self-Assessment (LASA) scales in quality of life studies. These scales measure subjects' perception of an intangible quantity, and cannot be handled as ratio variables because of their inherent non-linearity. We treat them as ordinal variables, measured on a continuous scale. A function (the g function) connects the scale with an underlying continuous latent variable. The link function is the inverse of the CDF of the assumed underlying distribution of the latent variable. A variety of link functions are currently implemented. Such models are described in Manuguerra et al (2020) <doi:10.18637/jss.v096.i08>.
Package details |
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Author | Maurizio Manuguerra [aut, cre], Gillian Heller [aut] |
Maintainer | Maurizio Manuguerra <maurizio.manuguerra@mq.edu.au> |
License | GPL (>= 2) |
Version | 2.0.2 |
Package repository | View on CRAN |
Installation |
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