tb.dilute {ISwR}

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\sqrt{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.