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UdderQuarterInfectionData  

Udder Quarter Infection Data
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Download and install UdderQuarterInfectionData package within the R console
Install from CRAN:
install.packages("UdderQuarterInfectionData")

Install from Github:
library("remotes")
install_github("cran/UdderQuarterInfectionData")

Install by package version:
library("remotes")
install_version("UdderQuarterInfectionData", "1.0.0")



Attach the package and use:
library("UdderQuarterInfectionData")
Maintained by
Luc Duchateau
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2017-09-06
Latest Update: 2017-09-06
Description:
The udder quarter infection data set contains infection times of individual cow udder quarters with Corynebacterium bovis (Laevens et al. 1997 <doi:10.3168/jds.S0022-0302(97)76295-7>). Obviously, the four udder quarters are clustered within a cow, and udder quarters are sampled only approximately monthly, generating interval-censored data. The data set contains both covariates that change within a cow (e.g., front and rear udder quarters) and covariates that change between cows (e.g., parity [the number of previous calvings]). The correlation between udder infection times within a cow also is of interest, because this is a measure of the infectivity of the agent causing the disease. Various models have been applied to address the problem of interdependence for right-censored event times. These models, as applied to this data set, can be found back in the publications found in the reference list.
How to cite:
Luc Duchateau (2017). UdderQuarterInfectionData: Udder Quarter Infection Data. R package version 1.0.0, https://cran.r-project.org/web/packages/UdderQuarterInfectionData. Accessed 12 Jun. 2026.
Previous versions and publish date:
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Complete documentation for UdderQuarterInfectionData
Functions, R codes and Examples using the UdderQuarterInfectionData R package
Some associated functions: Gamma_Frailty_Interval_Censoring . UdderQuarterInfectionData . udderquarterinfection . 
Some associated R codes: modelexamples.R . udderquarter.R .  Full UdderQuarterInfectionData package functions and examples
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