R: Tuberculin dilution assay

tb.dilute {ISwR} | R Documentation

## Tuberculin dilution assay

### Description

The `tb.dilute` data frame has 18 rows and 3 columns. It contains data from a drug test involving dilutions of tuberculin.

### Usage

    tb.dilute

### Format

This data frame contains the following columns:

`reaction`

  a numeric vector, reaction sizes (average of diameters) for tuberculin skin pricks.

`animal`

  a factor with levels `1`–`6`.

`logdose`

  a factor with levels `0.5`, `0`, and `-0.5`.

### Details

The actual dilutions were 1:100, 1:100√{10}, 1:1000. Setting the middle one to 1 and using base-10 logarithms gives the `logdose` values.

### Source

Anon. (1977), Exercises in Applied Statistics, part of Exercise 4.15, Dept.\ of Theoretical Statistics, Aarhus University.

[Package ISwR version 2.0-7 Index]