shelflife {glmtoolbox}

Shelf life of a photographic developer

Description

These data arise from an experiment using accelerated life testing to determine the estimated shelf life of a photographic developer. Maximum density and temperature seem to be reliable indicators of overall developer/film performance.

Usage

data(shelflife)

Format

A data frame with 21 rows and 3 variables:

Time

a numeric vector giving the shelf life, in hours.

Temp

a factor giving the temperature, in degrees celsius.

Dmax

a numeric vector giving the maximum density.

References

Chapman R.E. (1997) Degradation study of a photographic developer to determine shelf life, Quality Engineering 10:1, 137-140.

Examples

data(shelflife)
dev.new()
with(shelflife,plot(Dmax, Time, pch=16, col=as.numeric(Temp)))
legend("topright", legend=c("72C","82C","92C"), col=c(1:3), pch=16,
       title="Temperature", bty="n")