d.perm: Air permeability of concrete.
In qmrobust: Quality Management: Examples from the concrete industry

Description Usage Format Source References Examples

Air permeability of 75 samples of concrete from two selected elements of a bridge, measured by 5 teams.

1	data("d.perm")

A data frame with 150 observations on the following 5 variables.

team: The team that performed the measurement. Levels E H L S T
section: Element of the bridge: section 1 or 2
rep: Repetition
permeability: Air permeability [$m^2$]
perm.log: log10(permeability)

Jacobs, F., Leemann, A., Denari\'e, E. and Teruzzi, T. (2009). Recommendations for the quality control of concrete with air permeability measurements. Technical Report 641, Bundesamt f\"ur Strassen (ASTRA), Bern, Switzerland.

Stahel, W.A., Moro F. and . “Statistical Procedures for Performance-based Specification and Testing”. In:

data(d.perm)
showd(d.perm)
t.fac <- factor(paste(d.perm$team, d.perm$section, sep=":"))
plot(perm.log~t.fac, data=d.perm, notch=TRUE)

summary(aov(perm.log~team+section, data=d.perm))