vasicekreg development version (2026-08-09)

Boundary-adjusted mean regression

• Added the GAMLSS-conventional aliases d/p/q/rZANVASIM(), d/p/q/rOANVASIM(), and d/p/q/rZOANVASIM(). The established numbered names remain available. This correspondence allows likelihood-based methods such as vcov.gamlss() to locate each family’s density function.
• Added ZANVASIM(), a zero-adjusted normal-kernel Vasicek mean family, with nu modeling the probability at zero.
• Added OANVASIM(), a one-adjusted normal-kernel Vasicek mean family, with nu modeling the probability at one.
• Added ZOANVASIM(), a zero-and-one-adjusted normal-kernel Vasicek mean family. In this family, nu is the probability at zero and tau is the conditional probability at one among nonzero observations.
• Added the corresponding d0NVASIM(), p0NVASIM(), q0NVASIM(), r0NVASIM(), d1NVASIM(), p1NVASIM(), q1NVASIM(), r1NVASIM(), d01NVASIM(), p01NVASIM(), q01NVASIM(), and r01NVASIM() functions.
• Added analytical derivatives, randomized quantile residuals, marginal moments, and GAMLSS fitting support for all three boundary-adjusted families.

Documentation and tests

• Standardized the R source filenames as dpqr-0NvasicekM.R, dpqr-1NvasicekM.R, and dpqr-01NvasicekM.R.
• Added numerical verification of all first, second, and cross derivatives for ZANVASIM, OANVASIM, and ZOANVASIM.
• Clarified the roles of x and q and distinguished the boundary behavior of the zero-adjusted, one-adjusted, and zero-and-one-adjusted distributions.
• Updated the package overview to describe the boundary-adjusted families and to distinguish the tau parameter in ZOANVASIM from the fixed quantile level used by NVASIQ and LVASIQ.
• Added a package-level example comparing OANVASIM and BEOI using the one-inflated accuracy1 response from the ReadingSkills data.

vasicekreg 1.1.0 (2026-07-28)

Interface reorganization

• Renamed the normal-kernel mean family and distribution functions from VASIM to NVASIM.
• Renamed the normal-kernel quantile family and distribution functions from VASIQ to NVASIQ.
• Retained LVASIQ for the logistic-kernel quantile distribution functions.
• Renamed the corresponding R and C++ source files to identify the kernel (N or L) and parameterization (M or Q) explicitly.
• Renamed the internal Rcpp routines and regenerated their registration interfaces.
• Updated the namespace, documentation, examples, package overview, and tests for the new interface.

GAMLSS quantile level

• NVASIQ() does not accept tau as an argument. For GAMLSS fitting, tau must be defined as a scalar variable in the global environment.
• The distribution functions dNVASIQ(), pNVASIQ(), qNVASIQ(), and rNVASIQ() continue to accept tau explicitly.

Logistic-kernel quantile regression

• Added the LVASIQ() GAMLSS family for conditional quantile regression with the logistic-kernel Vasicek distribution.
• Implemented closed-form first, second, and cross derivatives with respect to mu and sigma; model fitting does not use numerical differentiation.
• Added quantile residual support and numerical moment functions for the family object.

vasicekreg 1.0.3 (2026-07-28)

Bug fixes

• Restored the missing implementation of qVASIM().
• Corrected log.p handling in all quantile functions.
• Corrected the bivariate-normal calculation used by the variance components of VASIM() and VASIQ().
• Made the fixed quantile level an explicit argument of VASIQ() and removed dependence on a global tau object.
• Corrected the second derivative with respect to mu in VASIQ().
• Added stable upper-tail calculations and consistent parameter-length checks to the C++ routines.

Documentation and tests

• Clarified that the logistic-kernel implementation currently provides distribution functions but not a GAMLSS family.
• Added executable tests for distribution identities, moments, derivatives, vectorization, and fixed-quantile handling.

vasicekreg 1.0.2 (2026-01-12)

Improvements

• Performance optimizations in dpqr-vasicekmean.R and dpqr-vasicekquant.R.

vasicekreg 1.0.1 (2021-12-05)

Bug fixes

• Corrected the term variance = function(mu, sigma) in the VASIM family.
• Corrected the term variance = function(mu, sigma) in the VASIQ family.

vasicekreg 1.0.0 (2021-07-05)

Initial release

• First release of the vasicekreg package on CRAN.