pock {GLMsData}

Pock counts

Description

In an experiment, “viral activity was assessed from pock counts at a series of dilutions of the viral medium”

Usage

data(pock)

Format

A data frame with 48 observations on the following 2 variables.

Count

the number of membrane pock counts; a numeric vector

Dilution

the dilution factor; a numeric vector

Details

The data come from a titration bioassay, in which viral activity was assessed from pock counts at different dilutions of the viral medium.

Source

P. J. Smith and D. F. Heitjan (1993) Testing and adjusting for departures from nominal dispersion in generalized linear models. Applied Statistics, 42, 31–41 (Table 1).

Examples

data(pock)
with( pock, tapply( Count, list(Dilution), mean) )
with( pock, tapply( Count, list(Dilution), var) )