Dataset:  beerbottle.dat

Source: R.G. Ault, E.J. Hudson, D.J. Linehan, and J.D. Woodward (1967).
"A Practical Approach to the Assessment of Head Retention of Bottled Beers,"
Journal of the Institute of Brewing, Vol. 73, Issue 6, pp. 558-566.

Description: Three Aspects of head retention are made
for 3 bottlings, (n1=n2=20,n3=19):
Head Formation, %Adhesion, and %Collapse Rate of foam.
Readings made:
A = @ 5secons: Top of beer foam
B = @ 30seconds: level of the residual of beer below zero mark
C = @ 240seconds: top of beer foam
D = level of the center of the foam
E = level of the residual beer

%Adhesion = 100((A+B)-(A-C))/(A+B)
%Collapse = 100((A+B)-(D+E))/(A+B)

Variables/Columns
Bottling    8
Bottle within Bottling    15-16
Head Formation  20-24
%Adhesion    28-32
%Collapse    36-40