class RooStats::ProfileLikelihoodCalculator: public RooStats::CombinedCalculator

 Default constructor (needed for I/O)

 Constructor from data, from a full model pdf describing both parameter of interest and nuisance parameters
 and from the set specifying the parameter of interest (POI).
 There is no need to specify the nuisance parameters since they are all other parameters of the model.
 When using the calculator for performing an hypothesis test one needs to provide also a snapshot (a copy)
 defining the null parameters and their value. There is no need to pass the alternate parameters. These
 will be obtained by the value maximazing the likelihood function

 Constructor from data and a model configuration
 If the ModelConfig defines a prior pdf for any of the parameters those will be included as constrained terms in the
 likelihood function

 Return a likelihood interval. A global fit to the likelihood is performed and
 the interval is constructed using the the profile likelihood ratio function of the POI

 Return the hypothesis test result obtained from the likelihood ratio of the
 maximum likelihood value with the null parameters fixed to their values, with respect keeping all parameters
 floating (global maximum likelihood value).

 clear internal fit result

 perform a global fit

 minimize likelihood