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*.

1 |

A data frame with 14 rows and 13 variables

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 |

p | corresponding p-value |

Morgan ER, Cavill L, Curry GE, Wood RM, Mitchell ESE (2005). Effects of aggregation and sample size on composite faecal egg counts in sheep, Veterinary Parasitology, 121:79-87.

1 2 3 | ```
data(tab1morgan)
if (require("lattice"))
xyplot(k.low+k.up+k ~meanFEC, type="p", pch=19, col=c(8,8,1), data=tab1morgan)
``` |

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