| 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.
SOTP2O5SiO2Fe2O3Al2O3CaOMgONa2OK2Olog(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)