@Article{countreg:Andrews:1991,
  author    = {Donald W. K. Andrews},
  title     = {Heteroskedasticity and Autocorrelation Consistent Covariance
               Matrix Estimation},
  year      = {1991},
  pages     = {817--858},
  journal   = {Econometrica},
  volume    = {59},
}

@Article{countreg:Andrews+Monahan:1992,
  author    = {Donald W. K. Andrews and J. Christopher Monahan},
  title     = {An Improved Heteroskedasticity and Autocorrelation Consistent Covariance
               Matrix Estimator},
  year      = {1992},
  pages     = {953--966},
  journal   = {Econometrica},
  volume    = {60},
  number    = {4},
}

@Article{countreg:Cameron+Trivedi:1990,
  author    = {A. Colin Cameron and Pravin K. Trivedi},
  title     = {Regression-based Tests for Overdispersion in the Poisson Model},
  year      = {1990},
  journal   = {Journal of Econometrics},
  pages     = {347--364},
  volume    = {46}
}

@Book{countreg:Cameron+Trivedi:1998,
  author    = {A. Colin Cameron and Pravin K. Trivedi},
  title     = {Regression Analysis of Count Data},
  year      = {1998},
  pages     = {411},
  publisher = {Cambridge University Press},
  address   = {Cambridge}
}

@Book{countreg:Cameron+Trivedi:2005,
  author    = {A. Colin Cameron and Pravin K. Trivedi},
  title     = {Microeconometrics: Methods and Applications},
  publisher = {Cambridge University Press},
  address   = {Cambridge},
  year      = {2005},
}

@Book{countreg:Chambers+Hastie:1992,
  editor    = {John M. Chambers and Trevor J. Hastie},
  title     = {Statistical Models in \proglang{S}},
  publisher = {Chapman \& Hall},
  year      = {1992},
  address   = {London}
}

@Article{countreg:Deb+Trivedi:1997,
  author    = {Partha Deb and Pravin K. Trivedi},
  title     = {Demand for Medical Care by the Elderly: A Finite Mixture Approach},
  journal   = {Journal of Applied Econometrics},
  year      = {1997},
  volume    = {12},
  pages     = {313--336}
}

@Manual{countreg:Erhardt:2008,
  title     = {\pkg{ZIGP}: Zero-inflated Generalized {P}oisson Regression Models},
  author    = {Vinzenz Erhardt},
  year      = {2008},
  note      = {\proglang{R}~package version~2.1},
  url       = {http://CRAN.R-project.org/package=ZIGP},
}

@Book{countreg:Fox:2002,
  author    = {John Fox},
  title     = {An \textsf{R} and \textsf{S-PLUS} Companion to Applied Regression},
  publisher = {Sage Publications},
  year      = {2002},
  address   = {Thousand Oaks, CA}
}

@Article{countreg:Gurmu:1997,
  author    = {Shiferaw Gurmu},
  title     = {Semi-Parametric Estimation of Hurdle Regression Models with an
               Application to Medicaid Utilization},
  journal   = {Journal of Applied Econometrics},
  year      = {1997},
  volume    = {12},
  pages     = {225--242}
}

@Article{countreg:Halekoh+Hojsgaard+Yan:2006,
  author    = {Ulrich Halekoh and S{\o}ren H{\o}jsgaard and Jun Yan},
  title     = {The \proglang{R} Package \pkg{geepack} for Generalized Estimating Equations},
  journal   = {Journal of Statistical Software},
  year      = {2006},
  volume    = {15},
  number    = {2},
  pages     = {1--11},  
  url       = {http://www.jstatsoft.org/v15/i02/}
}

@Article{countreg:Gurmu+Trivedi:1996,
  author    = {Shiferaw Gurmu and Pravin K. Trivedi},
  title     = {Excess Zeros in Count Models for Recreational Trips},
  journal   = {Journal of Business and Economic Statistics},
  year      = {1996},
  volume    = {14},
  pages     = {469--477}
}

@Manual{countreg:Jackman:2008,
  title     = {\pkg{pscl}: Classes and Methods for \proglang{R} Developed in the
               Political Science Computational Laboratory, Stanford University},
  author    = {Simon Jackman},
  organization = {Department of Political Science, Stanford University},
  address   = {Stanford, California},
  year      = {2008},
  note      = {\proglang{R}~package version~0.95},
  url       = {http://CRAN.R-project.org/package=pscl},
}

@Book{countreg:Kleiber+Zeileis:2008,
  title     = {Applied Econometrics with \proglang{R}},
  author    = {Christian Kleiber and Achim Zeileis},
  year      = {2008},
  publisher = {Springer-Verlag},
  address   = {New York},
  note      = {{ISBN} 978-0-387-77316-2},
}

@Article{countreg:Lambert:1992,
  author    = {Diane Lambert},
  title     = {Zero-inflated Poisson Regression, With an Application to Defects in Manufacturing},
  journal   = {Technometrics},
  year      = {1992},
  volume    = {34},
  pages     = {1--14}
}

@Article{countreg:Leisch:2004,
  title     = {{FlexMix}: A General Framework for Finite Mixture Models
               and Latent Class Regression in \proglang{R}},
  author    = {Friedrich Leisch},
  journal   = {Journal of Statistical Software},
  year      = {2004},
  volume    = {11},
  number    = {8},
  pages     = {1--18},
  url       = {http://www.jstatsoft.org/v11/i08/},
}

@Article{countreg:Long+Ervin:2000,
  author    = {J. Scott Long and Laurie H. Ervin},
  title     = {Using Heteroscedasticity Consistent Standard Errors
               in the Linear Regression Model},
  journal   = {The American Statistician},
  volume    = {54},
  year      = {2000},
  pages     = {217--224}
}

@Article{countreg:MacKinnon+White:1985,
  author    = {James G. MacKinnon and Halbert White},
  title     = {Some Heteroskedasticity-Consistent Covariance Matrix
               Estimators with Improved Finite Sample Properties},
  journal   = {Journal of Econometrics},
  year      = {1985},
  volume    = {29},
  pages     = {305--325},
}

@Book{countreg:McCullagh+Nelder:1989,
  author    = {McCullagh, P. and Nelder, John A.},
  title     = {Generalized Linear Models},
  edition   = {2nd},
  year      = {1989},
  publisher = {Chapman \& Hall},
  address   = {London}
}

@Article{countreg:Mullahy:1986,
  author    = {Mullahy, J.},
  title     = {Specification and Testing of Some Modified Count Data Models},
  year      = {1986},
  journal   = {Journal of Econometrics},
  volume    = {33},
  pages     = {341--365}
}

@Manual{countreg:Mwalili:2007,
  title     = {\pkg{zicounts}: Classical and Censored Zero-inflated Count Data Models},
  author    = {Samuel M. Mwalili},
  year      = {2007},
  note      = {\proglang{R}~package version~1.1.5 (orphaned)},
  url       = {http://CRAN.R-project.org/src/contrib/Archive/zicounts/},
}

@Article{countreg:Nelder+Wedderburn:1972,
  author    = {Nelder, J. A. and Wedderburn, R. W. M.},
  title     = {Generalized Linear Models},
  year      = {1972},
  journal   = {Journal of the Royal Statistical Society A},
  volume    = {135},
  pages     = {370--384}
}

@Article{countreg:Newey+West:1987,
  author    = {Whitney K. Newey and Kenneth D. West},
  title     = {A Simple, Positive-Definite, Heteroskedasticity and
               Autocorrelation Consistent Covariance Matrix},
  year      = {1987},
  pages     = {703--708},
  journal   = {Econometrica},
  volume    = {55}
}

@Book{countreg:Pinheiro+Bates:2000,
  author    = {Jose C. Pinheiro and Douglas M. Bates},
  title     = {"Mixed-Effects Models in \proglang{S} and \proglang{S-PLUS}},
  year      = {2000},
  publisher = {Springer-Verlag},
  address   = {New York}
}

@Manual{countreg:R:2008,
  title     = {\proglang{R}: {A} Language and Environment for Statistical Computing},
  author    = {{\proglang{R} Development Core Team}},
  organization  = {\proglang{R} Foundation for Statistical Computing},
  address   = {Vienna, Austria},
  year      = {2008},
  note      = {{ISBN} 3-900051-00-3},
  url       = {http://www.R-project.org/}
}

@Article{countreg:Stasinopoulos+Rigby:2007,
  author	= {D. Mikis Stasinopoulos and Robert A. Rigby},
  title		= {Generalized Additive Models for Location Scale and Shape ({GAMLSS}) in \proglang{R}},
  journal	= {Journal of Statistical Software},
  year		= {2007},
  volume	= {23},
  number	= {7},
  url		= {http://www.jstatsoft.org/v23/i07/}
}

@Book{countreg:Venables+Ripley:2002,
  author    = {William N. Venables and Brian D. Ripley},
  title     = {Modern Applied Statistics with \proglang{S}},
  edition   = {4th},
  year      = {2002},
  pages     = {495},
  publisher = {Springer-Verlag},
  address   = {New York}
}

@Article{countreg:White:1980,
  author    = {Halbert White},
  title     = {A Heteroskedasticity-Consistent Covariance Matrix Estimator
  	       and a Direct Test for Heteroskedasticity},
  year      = {1980},
  journal   = {Econometrica},
  volume    = {48},
  pages     = {817--838}
}

@Manual{countreg:Yee:2008,
  title     = {\pkg{VGAM}: Vector Generalized Linear and Additive Models},
  author    = {Thomas W. Yee},
  year      = {2008},
  note      = {\proglang{R}~package version~0.7-7},
  url       = {http://CRAN.R-project.org/package=VGAM},
}

@Article{countreg:Zeileis+Hothorn:2002,
  author    = {Achim Zeileis and Torsten Hothorn},
  title     = {Diagnostic Checking in Regression Relationships},
  journal   = {\proglang{R} News},
  year      = {2002},
  volume    = {2},
  number    = {3},
  pages     = {7--10},
  month     = {December},
  url       = {http://CRAN.R-project.org/doc/Rnews/}
}

@Article{countreg:Zeileis:2004,
  author    = {Achim Zeileis},
  title     = {Econometric Computing with {HC} and {HAC} Covariance Matrix Estimators},
  year      = {2004},
  journal   = {Journal of Statistical Software},
  volume    = {11},
  number    = {10},
  pages     = {1--17},
  url       = {http://www.jstatsoft.org/v11/i10/}
}

@Article{countreg:Zeileis:2006,
  author    = {Achim Zeileis},
  title	    = {Object-oriented Computation of Sandwich Estimators},
  year	    = {2006},
  journal   = {Journal of Statistical Software},
  volume    = {16},
  number    = {9},
  pages	    = {1--16},
  url	    = {http://www.jstatsoft.org/v16/i09/}
}

@Manual{countreg:Zeileis+Kleiber:2008,
  title     = {\pkg{AER}: Applied Econometrics with \proglang{R}},
  author    = {Achim Zeileis and Christian Kleiber},
  year      = {2008},
  note      = {\proglang{R}~package version~0.9-0},
  url       = {http://CRAN.R-project.org/package=AER},
}
