Coefficients and variance-covariance matrix from the Alava (2013) mixture model used to map HAQ score to utilities.
utility.mixture
List containing coefficient vector (point estimates and parameter names) and variance-covariance matrix, and indices for parameters.
Alava, Monica Hernandez, et al. "The relationship between EQ-5D, HAQ and pain in patients with rheumatoid arthritis." Rheumatology 52.5 (2013): 944-950.