Description Usage Format Source References Examples
Chemical composition of N=344 commercial samples of concentrated grape must used in wine production. The four variables recorded are considered for discovering adulteration with added sugar from non-grape plants. In unadulterated wines, myoinositol and D/H(I) should follow normal distributions.
1 |
A data frame with 344 observations on the following 4 variables.
Myo
Myo-inositol mg/kg sugar
Scyllo
Scylloinositol mg/kg sugar
DH.I
D/H(I) (ppm)
DH.II
D/H(II) (ppm)
Monetti, A., G. Versini, G. Dalpiaz and F. Reniero (1996) “Sugar adulterations control in concentrated rectified grape musts by finite mixture distribution analysis of the myo- and scyllo-inositol contents and the D/H methyl ratio of fermentative alcohol” Journal of Agricultural and Food Chemistry 44:2194-2201
Flury, B.D. (1997) A First Course in Multivariate Statistics, New York: Springer
1 2 3 4 5 6 7 | data(wine.sugar)
## Not run:
with(wine.sugar, plot(log(Myo), DH.I))
require(MASS)
dens <- with(wine.sugar, kde2d(log(Myo), DH.I))
contour(dens)
## End(Not run)
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Loading required package: MASS
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