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The permeability of building materials.
data(Perm)
A data frame with 81 rows (each sample) and 3 columns:
The day of the data collection; 1 to 9
1
9
The machine; one of A, B or C
A
B
C
The permeability of the sample, in seconds
A. Hald (1952). Statistical theory with engineering applications. New York: Wiley.