A regression framework for response variables which are continuous selfrating scales such as the Visual Analog Scale (VAS) used in pain assessment, or the Linear Analog SelfAssessment (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 nonlinearity. 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.
Package details 


Author  Maurizio Manuguerra [aut, cre], Gillian Heller [aut] 
Maintainer  Maurizio Manuguerra <[email protected]> 
License  GPL (>= 2) 
Version  2.0.0 
Package repository  View on CRAN 
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