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flexhaz 0.5.0

Changes

• Added helper distribution constructors: dfr_exponential(), dfr_weibull(), dfr_gompertz(), dfr_loglogistic() with analytical hazard, cumulative hazard, score, and Hessian functions where available.
• Added diagnostic methods: residuals() (Cox-Snell and Martingale), plot() (survival, hazard, cumulative hazard), qqplot_residuals().
• Added density() method (alias for pdf).
• Added assumptions() method for listing model assumptions.
• Added kaplan_meier() internal utility for empirical survival estimation.
• Added support for left-censored observations (delta = -1).
• Improved numerical stability in log-likelihood computation.
• Removed femtograd dependency — users supply their own derivative functions via score_fn and hess_fn, or the package falls back to numDeriv.

flexhaz 0.1.0

Initial release.

Features

• dfr_dist() constructor for creating distributions from hazard functions
• Complete distribution interface: hazard(), cum_haz(), surv(), cdf(), pdf(), inv_cdf(), sampler()
• Likelihood model interface: loglik(), score(), hess_loglik(), fit()
• Support for right-censored survival data
• Numerical integration for cumulative hazard
• Inverse CDF sampling

Examples

Supports modeling complex hazard patterns:

• Exponential (constant hazard)
• Weibull (monotonic hazard)
• Bathtub curves (infant mortality + useful life + wear-out)
• Proportional hazards with covariates

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.