Compare the single-predictor health risks when all of the other predictors in Z are fixed to their a specific quantile to when all of the other predictors in Z are fixed to their a second specific quantile.

1 2 3 |

`fit` |
An object containing the results returned by a the |

`y` |
a vector of outcome data of length |

`Z` |
an |

`X` |
an |

`which.z` |
vector indicating which variables (columns of |

`qs.diff` |
vector indicating the two quantiles at which to compute the single-predictor risk summary |

`qs.fixed` |
vector indicating the two quantiles at which to fix all of the remaining exposures in |

`preds.method` |
method for obtaining posterior summaries at a vector of new point. Currently only implemented for |

`sel` |
logical expression indicating samples to keep; defaults to keeping the second half of all samples |

`z.names` |
optional vector of names for the columns of |

`...` |
other argumentd to pass on to the prediction function |

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