Dataset due to Danaher; also an analysis ab initio
Usage
data(danaher)
Format
danaher is a matrix (of class Oarray) that
represents Danaher and Hardie's Table 1
Details
Since bacon is often eaten with eggs, it is reasonable to
expect that it is purchased with eggs.
Danaher and Hardie use a dataset obtained from a sample of 548 households over
four consecutive store trips. They considered only grocery shopping
trips with a total basket value of at least five dollars. For each
household, they counted the total number of bacon purchases in their
four eligible shopping trips, and the total number of egg purchases
for the same trips.
Object danaher is a five-by-five matrix of class Oarray
with entry (i,j) indicating the number of shoppers buying bacon
on i occasions and eggs on j occasions (note the zero
offset). Thus danaher[1,2]=16 indicates that 16 shoppers
bought bacon on 1 occasion and eggs on 2 occasions.
References
P. J. Danaher and B. G. S. Hardie 2005. “Bacon with your eggs?
Applications of a new bivariate beta-binomial distribution”.
The American Statistician, 59(4):282
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> library(MM)
Loading required package: magic
Loading required package: abind
Loading required package: partitions
Loading required package: emulator
Loading required package: mvtnorm
Loading required package: Oarray
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/MM/danaher.Rd_%03d_medium.png", width=480, height=480)
> ### Name: danaher
> ### Title: Dataset due to Danaher
> ### Aliases: danaher
> ### Keywords: datasets
>
> ### ** Examples
>
> data(danaher)
> Lindsey_MB(danaher)
Call: glm(formula = d ~ (.), family = poisson, data = x, offset = Off)
Coefficients:
(Intercept) bacon eggs `bacon:nbacon` `eggs:neggs`
5.5117 -1.6528 -1.0487 -0.5149 -0.3555
`bacon:eggs`
0.3006
Degrees of Freedom: 24 Total (i.e. Null); 19 Residual
Null Deviance: 3046
Residual Deviance: 18.67 AIC: 108.3
>
> # Dataset from table 3 follows; see also the example at Lindsey.Rd
> mags <-
+ c(2463, 35, 44, 14, 16, 7, 262, 20, 2, 2, 0, 0, 0, 2, 17, 2,
+ 0, 2, 0, 0, 3, 8, 0, 0, 1, 0, 0, 4, 8, 0, 1, 1, 0, 0, 3, 3,
+ 0, 0, 0, 0, 0, 1, 52, 2, 1, 0, 2, 0, 22)
> dim(mags) <- c(7,7)
> mags <- as.Oarray(mags,offset=0)
> dimnames(mags) <-
+ list(AA=as.character(0:6),Sig=as.character(0:6)) # messy kludge in Lindsey_MB()
> summary(Lindsey_MB(mags))
Call:
glm(formula = d ~ (.), family = poisson, data = x, offset = Off)
Deviance Residuals:
Min 1Q Median 3Q Max
-8.3202 -0.6458 -0.2023 2.0970 6.8610
Coefficients:
Estimate Std. Error z value Pr(>|z|)
(Intercept) 7.782592 0.020279 383.770 < 2e-16 ***
AA -0.373631 0.010613 -35.207 < 2e-16 ***
Sig -0.633903 0.021891 -28.958 < 2e-16 ***
`AA:nAA` -0.900871 0.014309 -62.958 < 2e-16 ***
`Sig:nSig` -0.935319 0.018848 -49.625 < 2e-16 ***
`AA:Sig` 0.040440 0.006655 6.077 1.22e-09 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
(Dispersion parameter for poisson family taken to be 1)
Null deviance: 43882.55 on 48 degrees of freedom
Residual deviance: 345.22 on 43 degrees of freedom
AIC: 466.88
Number of Fisher Scoring iterations: 6
>
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>
> dev.off()
null device
1
>