eggCounts (version 1.4)

tab1morgan: Abundance of trichostrongyloid eggs in sheep faeces

Description

This data set contains information about the abundance and distribution of trichostrongyloid eggs in the faeces of 14 groups of commercially farmed sheep given in Table 1 in Morgan et al. (2005). The faecal egg counts were assumed to follow a negative binomial distribution with mean \(m\) and overdispersion parameter \(k\).

Usage

data(tab1morgan)

Format

A data frame with 14 rows and 13 variables

Details

The data set has columns:

group	ID number for the groups
ageclass	age class of sheep: "Lambs" or "Ewes"
month	month when samples were taken
n	number of sheep in group
meanFEC	mean number of eggs per gram (epg) of faeces
k	estimated overdispersion parameter \(k\)
k.low	lower limit of a 95% confidence interval for \(k\)
k.up	lower limit of a 95% confidence interval for \(k\)
maxFEC	maximal number of eggs per gram of faeces per group
percentageLarger1000	percentage of samples with more than 1000 epg
Chi2	goodness-of-fit statistic for the negative binomial distribution
df	corresponding degrees of freedom

Examples

# NOT RUN {
data(tab1morgan)
if (require("lattice"))
   xyplot(k.low+k.up+k ~meanFEC, type="p", pch=19, col=c(8,8,1), data=tab1morgan)
# }