Version: 2.1
Category: The constrained optimization procedure is now done in two
        stages for LEXPIT for the linear and expit components. This has
        the benefit of reducing constraints to linear piece where all
        inequalities will be linear in the parameters
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Version: 2.1
Category: Naming of ci changed to confint
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Version: 2.1
Category: The hosmerlem function has been changed to gof
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Version: 2.1
Category: The gof.pearson function has been added to compute Pearson's
        goodness-of-fit test
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Version: 2.1
Category: A revised vignette reflects the changes in 2.1
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Version: 2.2
Category: Added warn argument to suppress warnings thrown when testing
        for feasible parameters
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Version: 2.2
Category: Function excess.risk added. Computes binned excess risk by a
        grouping variable. Useful for diagnosing functional
        relationship between risk and explanatory variable
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Version: 2.2
Category: Correction to variance calculation to include case status as
        a stratification variable for case-control studies
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Version: 2.2
Category: Revised vignette includes description of use of the
        excess.risk function
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Version: 2.2
Category: Added likelihood ratio test for hypothesis testing with
        cohort data (method LRT
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Version: 2.2
Category: Added leverage and displacement functions for blm and lexpit
        models to diagnose the model fit
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Version: 2.3
Category: Fixes to vcov method to handle big matrices
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Version: 2.3
Category: Correction to gof function and addition of adjustment for
        weighted estimates
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Version: 2.4
Category: Added initialization parameters in influence methods
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Version: 2.4
Category: Modified summary method to shorten print out of t and
        p-values
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Version: 2.4
Category: Added aarp data set
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Version: 2.4.1
Category: Removed dev directory
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Version: 2.4.2
Category: Added risk.exposure.plot; removed excess.risk function;
        updated vignette with example for this plot
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Version: 2.4.3
Category: Corrected bug in stratification variable in variance
        calculation for blm (function: vcov.influence.blm.strata);
        update predict method so response variable is not necessary
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Version: 2.4.4
Category: Added formula accessor; Made output of predict a vector; Use
        printCoefmat in the summary function; Created crude.risk
        function; Added log-likelihood method; Added dependency on
        stats4; References and CITATION to JSS paper
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