ash: ash data

Description Usage Format Details Source References Examples

Description

Data from 99 ash samples originating from different biomass, measured on 9 variables; 8 log-transformed variables are added.

Usage

1

Format

A data frame with 99 observations on the following 17 variables.

SOT

a numeric vector

P2O5

a numeric vector

SiO2

a numeric vector

Fe2O3

a numeric vector

Al2O3

a numeric vector

CaO

a numeric vector

MgO

a numeric vector

Na2O

a numeric vector

K2O

a numeric vector

log(P2O5)

a numeric vector

log(SiO2)

a numeric vector

log(Fe2O3)

a numeric vector

log(Al2O3)

a numeric vector

log(CaO)

a numeric vector

log(MgO)

a numeric vector

log(Na2O)

a numeric vector

log(K2O)

a numeric vector

Details

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.

Source

K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemometrics. CRC Press, Boca Raton, FL, 2009.

References

K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemometrics. CRC Press, Boca Raton, FL, 2009.

Examples

1
2

Example output

Loading required package: rpart
'data.frame':	99 obs. of  17 variables:
 $ SOT       : int  680 680 680 1070 1350 730 1250 1320 760 1000 ...
 $ P2O5      : num  7.51 9.6 7.87 11.96 10.8 ...
 $ SiO2      : num  3.45 6.16 3.22 5.59 3.08 ...
 $ Fe2O3     : num  0.285 0.328 0.261 0.333 0.411 ...
 $ Al2O3     : num  0.36 0.438 0.322 0.378 0.499 ...
 $ CaO       : num  23.4 30.9 27.9 23.9 27.3 ...
 $ MgO       : num  2.94 3.63 3.83 5.53 5.8 ...
 $ Na2O      : num  0.3 0.192 0.291 0.181 0.235 ...
 $ K2O       : num  61.7 48.7 56.3 52.1 51.9 ...
 $ log(P2O5) : num  2.02 2.26 2.06 2.48 2.38 ...
 $ log(SiO2) : num  1.24 1.82 1.17 1.72 1.13 ...
 $ log(Fe2O3): num  -1.255 -1.115 -1.343 -1.1 -0.889 ...
 $ log(Al2O3): num  -1.022 -0.826 -1.133 -0.973 -0.695 ...
 $ log(CaO)  : num  3.15 3.43 3.33 3.17 3.31 ...
 $ log(MgO)  : num  1.08 1.29 1.34 1.71 1.76 ...
 $ log(Na2O) : num  -1.2 -1.65 -1.23 -1.71 -1.45 ...
 $ log(K2O)  : num  4.12 3.89 4.03 3.95 3.95 ...

chemometrics documentation built on May 1, 2019, 7:58 p.m.