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.
|Author||Maurizio Manuguerra [aut, cre], Gillian Heller [aut]|
|Maintainer||Maurizio Manuguerra <[email protected]>|
|License||GPL (>= 2)|
|Package repository||View on CRAN|
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