Mice Depletion Data
Mice.Rd
Data from Kastenbaum and Lamphiear (1959). The table gives the number of depletions (deaths) in 657 litters of mice, classified by litter size and treatment. This data set has become a classic in the analysis of contingency tables, yet unfortunately little information on the details of the experiment has been published.
Usage
data("Mice")
Format
A frequency data frame with 30 observations on the following 4 variables, representing a 5 x 2 x 3 contingency table.
litter
litter size, a numeric vector
treatment
treatment, a factor with levels
A
B
deaths
number of depletions, a factor with levels
0
1
2+
Freq
cell frequency, a numeric vector
Source
Goodman, L. A. (1983) The analysis of dependence in cross-classifications having ordered categories, using log-linear models for frequencies and log-linear models for odds. Biometrics, 39, 149-160.
References
Kastenbaum, M. A. & Lamphiear, D. E. (1959) Calculation of chi-square to calculate the no three-factor interaction hypothesis. Biometrics, 15, 107-115.
Examples
data(Mice)
# make a table
ftable(mice.tab <- xtabs(Freq ~ litter + treatment + deaths, data=Mice))
#> deaths 0 1 2+
#> litter treatment
#> 7 A 58 11 5
#> B 75 19 7
#> 8 A 49 14 10
#> B 58 17 8
#> 9 A 33 18 15
#> B 45 22 10
#> 10 A 15 13 15
#> B 39 22 18
#> 11 A 4 12 17
#> B 5 15 8
#library(vcd)
vcd::mosaic(mice.tab, shade=TRUE)