Description Usage Format Details Source Examples

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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