|Type of Tool
|Zero Inflated Poisson R
| The R code fits the Zero-Inflated Poisson (ZIP) like log-linear model to pre-post longitudinal data with missing value at post-assessment, using a set of weighted generalized estimating equations to provide distribution-free inference about model parameters. The output includes estimates and standard errors for both the logistic and Poisson regression parts of the ZIP like model.
An introduction to use the Zero-Inflated Poisson R Program
|Classification Graph Type
| Dobbie, M.J. and Welsh, A.H. Modeling correlated zero-inflated count data. Australian & New Zealand Journal of Statistics, 2001, 43, 431-444.
Kowalski, J. and Tu, X.M. Modern Applied U-Statistics, Wiley, New York, 2007.
Lambert, D. Zero-inflated Poisson regression, with an application to defects in manufacturing. Technometrics, 1992, 34, 1-14
McCullagh, P. and Nelder, J.A. Generalized Linear Models, 2nd.ed., Chapman and Hall, London. 1989.
| The required parameters (n, noc):
1. n=Number of subjects
2. noc=Number of covariates
|R-Code - Attachment
|SAS-Code - Attachment
|Stata-Code - Attachment
|Other Code - Attachment
|Called Data Manipulation
|Called Checking Macro
|December 20, 2010
|R Example Code
|R Example Output
|Rochester_ZIP_R Example Code
|Rochester_ZIP_R Example Output
|Special Features Attached
|Special Features Text
|Section with calls to needed macros
|Macro call with fully specified parameters
|Section with definitions of global macro parameters
|Section with definitions of local macro variables
|Stat Tools Disclaimer
| This R function is developed by Dr. Naiji Lu , along with other members in the Department of Biostatistics and Computational Biology at the University of Rochester under the auspice of the CTSI BERD with the intent to facilitate data analyses and reporting in clinical and related research. It is copyrighted by Dr. Naiji Lu on December 20, 2010 and distributed for free public access
The development of this macro was supported in part by an NIH grant R21/R33 DA027521.
|The views expressed within CTSpedia are those of the author and must not be taken to represent policy or guidance on the behalf of any organization or institution with which the author is affiliated.
| Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF ERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT OLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.