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Firework mixtures
Description
Data show two measured properties, brilliance and vorticity, of 81 girandoles composed of different mixtures of five ingredients: a – e. Of these ingredients, a and b are the primary light-producting, c is principal propellant, and d and e are binding agents for c.
Usage
data(Firework)
Details
The data consist of 81 cases and 7 variables: ingredients a, b, c, d, and e, and the two measured properties brilliance and vorticity. The 81 different mixtures form a special experiment design. First the 81 possible quadruples formed from the three values -1, 0, 1 were arranged in ascending order. Then for each such quadruple z, the corresponding mixture x(z)=(a,b,c,d,e)=alrInv(z) is computed. Thus the No. 4 girandole corresponds to z=(-1,-1,0,-1) and so is composed of a mixture x=(.12,.12,.32,.12,.32) of the five ingredients. All 5-part mixtures sum up to one.
Note
Courtesy of J. Aitchison
Source
Aitchison: CODA microcomputer statistical package, 1986, the file name YATQUAD.DAT, here included under the GNU Public Library Licence Version 2 or newer.
References
Aitchison: The Statistical Analysis of Compositional Data, 1986, Data 13, pp17.