mammary

A total of 76 female rats were injected with a carcinogen
for mammary cancer. Then, all animals were given retinyl acetate
(retinoid) to prevent mammary cancer for 60 days. After this phase,
the 48 animals that remained tumor-free were randomly assigned to
continue retinoid prophylaxis or control. Rats were then palpated for
tumors twice weekly, and observations ended 182 days after initial
carcinogen injections began. The main objective of the analysis was
to assess the difference in tumor development between the treated
and control groups.

datasets

Set of tools for the statistical analysis of data using: (1) normal linear models; (2) generalized linear models; (3) negative binomial regression models as alternative to the Poisson regression models under the presence of overdispersion; (4) beta-binomial and random-clumped binomial regression models as alternative to the binomial regression models under the presence of overdispersion; (5) Zero-inflated and zero-altered regression models to deal with zero-excess in count data; (6) generalized nonlinear models; (7) generalized estimating equations for cluster correlated data.

Luis Hernando Vanegas

glmtoolbox

Set of Tools to Data Analysis using Generalized Linear Models

Luz Marina Rondón

Gilberto A. Paula

mammary function

A data frame with 48 rows and 2 variables:<dl>
 <dt>group</dt>
<dd>a factor giving the group to which the rat was assigned: "retinoid" or "control".</dd> <dt>tumors</dt>
<dd>a numeric vector giving the number of tumors identified on the rat.</dd>
</dl>

Format

Ability of retinyl acetate to prevent mammary cancer in rats — mammary

A data frame with 48 rows and 2 variables:<dl>
 <dt>group</dt>
<dd>a factor giving the group to which the rat was assigned: "retinoid" or "control".</dd>

 <dt>tumors</dt>
<dd>a numeric vector giving the number of tumors identified on the rat.</dd>


</dl>

mammary: Ability of retinyl acetate to prevent mammary cancer in rats

Description

Usage

Arguments

Format

References

Examples