Exchangable cations in forest soil data set
The forest soil data set contains measurements on 58 soil pits in the Hubbard Brook Experimental Forest in north-central New Hampshire. The excavations were done in 1983 and 1986. The soil samples were analyzed for the exchangeable cations of aluminium, calcium, magnesium, potassium and sodium. The pit locations in both data sets can be classified by the type of the forest:
1: spruce-fir (11 samples),
2: high elevation hardwood (23 samples) and
3: low elevation hardwood (24 samples)).
Additionally the degree of logging disturbance can be considered (all 0 in the 1983 data set):
0: uncut forest,
1: cut, undisturbed by machinery and
2: cut, disturbed.
The observations are expressed in grams of exchangeable cations per square meter.
data(soil)
A data frame with 116 observations on the following 7 variables.
FType of forest
DDegree of logging disturbance
AlLevel of the exchangable cations in Al
CaLevel of the exchangable cations in Ca
MgLevel of the exchangable cations in Mg
KLevel of the exchangable cations in K
NaLevel of the exchangable cations in Na
Morrison D.F., 2005, Multivariate Statistical Methods, Thompson
Vanden Branden K, Hubert M (2005). Robust Classiffication in High Dimensions Based on the SIMCA Method. Cbemometrics and Intelligent Laboratoty Sysiem, 79: 10–21.
data(soil) soil1983 <- soil[soil$D == 0, -2] # only 1983, remove column D (always 0) (cc <- Linda(F~., data=soil)) (pr <- predict(cc)) pr@classification
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