dressing {ffmanova} | R Documentation |
A dataset from an experiment studying structural and rheological properties of a full fat dressing.
data(dressing)
A data frame with 29 observations on the following 7 variables.
press
stab
emul
day
1
, ..., 5
.
The day the experimental run was performed on.visc
rheo
pvol
The data comes from an experiment in which full fat dressings were produced with different amount of stabiliser and emulsifier, and with different homogenisation pressure (se above).
A full factorial 3^3 design with two additional center points was used. The experiment was run over five days. It was unknown up front how many experimental runs could be performed each day, so the order of the runs was randomised.
For each dressing, viscosity, rheology and particle volume measurements were taken (se above).
The day is stored as a factor. The other design variables are stored
as numerical variables. If one wants to use them as factors, one can
use e.g. factor(press)
in the model formula, or
dressing$press <- factor(dressing$press)
prior to calling the
modelling function.
The data is taken from a research project financed by a grant (131472/112) from the Norwegian Research Council. The project was managed by Stabburet, which is a major manufacturer of dressing in Norway.