invtime | R Documentation |

This function can be used when predicting in Relative Survival using the transformed time regression
model (using `rstrans`

function). It inverses the time from Y to T in relative survival using the
given ratetable. The times Y can be produced with the `rstrans`

function, in which case, this is the reverse
function. This function does the transformation for one person at a time.

invtime(y, age, sex, year, scale, ratetable, lower, upper)

`y` |
time in Y. |

`age` |
age of the individual. Must be in days. |

`sex` |
sex of the individual. Must be coded in the same way as in the |

`year` |
date of diagnosis. Must be in a date format |

`scale` |
numeric value to scale the results. If |

`ratetable` |
a table of event rates, such as |

`lower` |
the lower bound of interval where the result is expected. This argument is optional, but, if given, can shorten the time the function needs to calculate the result. |

`upper` |
the upper bound of interval where the result is expected. See |

Works only with ratetables that are split by age, sex and year. Transforming can be computationally intensive, use lower and/or upper to guess the interval of the result and thus speed up the function.

A list of values

`T` |
the original time |

`Y` |
the transformed time |

Package: Pohar M., Stare J. (2006) "Relative survival analysis in R." Computer Methods and Programs in Biomedicine, **81**: 272-278.

Relative survival: Pohar, M., Stare, J. (2007) "Making relative survival analysis relatively easy."
Computers in biology and medicine, **37**: 1741-1749.

`rstrans`

data(slopop) invtime(y = 0.1, age = 23011, sex = 1, year = 9497, ratetable = slopop)

relsurv documentation built on Dec. 28, 2022, 2:25 a.m.

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