Description Usage Arguments Details Value Examples

In contexts where an LD99 estimate will be used as a data value in a further analysis step, the inverse of the variance may be used as a weight. The y-ordinate is for the link function transformed value of a specified mortality proportion, commonly 0.50, or 0.90, or 0.99

1 | ```
varRatio(phat = 0.99, b, vv, link = "cloglog")
``` |

`phat` |
Mortality proportion |

`b` |
Length 2 vector of intercept and slope |

`vv` |
Variance-covariance matrix for intercept and slope |

`link` |
Link function that transforms expected mortalities to the scale of the linear predictor |

This function should only be used, in order to speed up
calculations that use the function `fieller`

(call `fieller`

with (`type="Delta"`

)),
in a context where it is to be used many times,
and where a check has been made that its use leads to
confidence intervals that are a close approximation to those
given with the default argument (`type="Fieller"`

).

A vector, with elements

`xhat` |
Estimate |

`var` |
Variance, calculated using the Delta method, See
the help page for |

1 2 3 4 5 |

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