Oslo Transect Data
The oslo Transect data set contains 360 samples of different plant species collected along a 120 km transect running through the city of Oslo, Norway.
data(OsloTransect)
A data frame with 360 observations on the following 38 variables.
X.IDa numeric vector, unique ID of the sample
X.MATa factor with levels BBA BIL BWO FER MOS ROG SNE STW TWI
XCOOa numeric vector, X coordinate
YCOOa numeric vector, Y coordinate
XCOO_kma numeric vector
YCOO_kma numeric vector
X.FORESTa factor with levels BIRSPR MIXDEC PINE SPRBIR SPRPIN SPRUCE
DAYa numeric vector
X.WEATHERa factor with levels CLOUD MOIST NICE RAIN
ALTa numeric vector
X.ASPa factor with levels E FLAT N NE NW S SE SW W
X.GRVEGa factor with levels BLGR BLLY BLMOLI BLUE BLUGRA GRAS GRBLU GRFE GRMO LYLI MIX MOGR MOSS
X.FLITHOa factor with levels CAMSED GNEID_O GNEIS_O GNEIS_R MAGM MICSH
Ag_ppba numeric vector
As_asha numeric vector
Ba numeric vector
Baa numeric vector
Caa numeric vector
Cda numeric vector
Coa numeric vector
Cra numeric vector
Cua numeric vector
Fea numeric vector
Hg_ppba numeric vector
Ka numeric vector
Laa numeric vector
LOIa numeric vector
Mga numeric vector
Mna numeric vector
Moa numeric vector
Nia numeric vector
Pa numeric vector
Pba numeric vector
Sa numeric vector
Sba numeric vector
Sra numeric vector
Tia numeric vector
Zna numeric vector
Samples of different plant species were collected along a 120 km
transect running through the city of Oslo,
Norway (forty samples each of leaves, needles,roots or
barks of several plant species), and the concentrations of
25 chemical elements for the sample materials are reported.
The factors that influenced the observed element
concentrations in the sample materials were investigated.
This data set was used in Todorov and Filzmoser (2007) for
illustration of the robust statistics for one-way MANOVA implemented in the function
Wilks.test.
REIMANN,C., ARNOLDUSSEN,A., BOYD,R., FINNE,T.E., NORDGULEN,Oe., VOLDEN,T. and ENGLMAIER,P. (2006) The Influence of a city on element contents of a terrestrial moss (Hylocomium splendens), The Science of the Total Environment 369 419–432.
REIMANN,C., ARNOLDUSSEN,A., BOYD,R., FINNE,T.E., KOLLER,F., NORDGULEN,Oe., and ENGLMAIER,P. (2007) Element contents in leaves of four plant species (birch, mountain ash, fern and spruce) along anthropogenic and geogenic concentration gradients, The Science of the Total Environment 377 416–433.
REIMANN,C., ARNOLDUSSEN,A., FINNE,T.E., KOLLER,F., NORDGULEN,Oe., and ENGLMAIER,P., (2007) Element contents in birch leaves, bark and wood under different anthropogenic and geogenic conditions, Applied Geochemistry, 22 1549–1566.
Todorov V. and Filzmoser P. (2007) Robust statistic for the one-way MANOVA, submetted to the Journal of Environmetrics.
data(OsloTransect)
str(OsloTransect)
##
## Log-transform the numerical part of the data,
## choose the desired groups and variables and
## perform the classical Wilks' Lambda test
##
OsloTransect[,14:38] <- log(OsloTransect[,14:38])
grp <- OsloTransect$X.FLITHO
ind <- which(grp =="CAMSED" | grp == "GNEIS_O" |
grp == "GNEIS_R" | grp=="MAGM")
(cwl <- Wilks.test(X.FLITHO~K+P+Zn+Cu,data=OsloTransect[ind,]))
##
## Perform now the robust MCD based Wilks' Lambda test.
## Use the already computed multiplication factor 'xd' and
## degrees of freedom 'xq' for the approximate distribution.
##
xd <- -0.003708238
xq <- 11.79073
(mcdwl <- Wilks.test(X.FLITHO~K+P+Zn+Cu,data=OsloTransect[ind,],
method="mcd", xd=xd, xq=xq))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.