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A function to retrieve the Hessian of the baseline hazard function
# S3 method for basehazardspec hessbasehazard(obj, ...)
a function returning the Hessian of the baseline hazard
an object of class basehazardspec
additional arguments -- currently there are none, but this is for extensibility
exponentialHaz, weibullHaz, gompertzHaz, makehamHaz, tpowHaz