R: Verify that an object is of class ratetable.

is.ratetable {survival} | R Documentation

## Verify that an object is of class ratetable.

### Description

The function verifies not only the `class` attribute, but the structure of the object.

### Usage

    is.ratetable(x, verbose=FALSE)

### Arguments

`x` | the object to be verified.
`verbose` | if `TRUE` and the object is not a ratetable, then return a character string describing the way(s) in which `x` fails to be a proper ratetable object.

### Details

Rate tables are used by the `pyears` and `survexp` functions, and normally contain death rates for some population, categorized by age, sex, or other variables. They have a fairly rigid structure, and the `verbose` option can help in creating a new rate table.

### Value

returns `TRUE` if `x` is a ratetable, and `FALSE` or a description if it is not.

### See Also

`pyears`, `survexp`.

### Examples

    is.ratetable(survexp.us)  # True
    is.ratetable(cancer)      # False

[Package survival version 3.2-7 Index]