ash {chemometrics} | R Documentation |
Data from 99 ash samples originating from different biomass, measured on 9 variables; 8 log-transformed variables are added.
data(ash)
A data frame with 99 observations on the following 17 variables.
SOT
P2O5
SiO2
Fe2O3
Al2O3
CaO
MgO
Na2O
K2O
log(P2O5)
log(SiO2)
log(Fe2O3)
log(Al2O3)
log(CaO)
log(MgO)
log(Na2O)
log(K2O)
The dependent variable Softening Temperature (SOT) of ash should be modeled by the elemental composition of the ash data. Data from 99 ash samples - originating from different biomass - comprise the experimental SOT (630-1410 centigrades), and the experimentally determined eight mass concentrations the listed elements. Since the distribution of the elements is skweed, the log-transformed variables have been added.
K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemeometrics. CRC Press. To appear.
K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemeometrics. CRC Press. To appear.
data(ash) str(ash)