| dudi {ade4} | R Documentation |
as.dudi is called by many functions (dudi.pca, dudi.coa, dudi.acm, ...)
and not directly by the user. It creates duality diagrams.
t.dudi returns an object of class 'dudi' where the rows are the columns and the columns are the rows
of the initial dudi.
is.dudi returns TRUE if the object is of class dudi
redo.dudi computes again an analysis, eventually changing the number of kept axes. Used by other functions.
as.dudi(df, col.w, row.w, scannf, nf, call, type, tol = 1e-07,
full = FALSE)
## S3 method for class 'dudi'
print(x, ...)
is.dudi(x)
redo.dudi(dudi, newnf = 2)
## S3 method for class 'dudi'
t(x)
## S3 method for class 'dudi'
summary(object, ...)
## S3 method for class 'dudi'
x[i,j]
df |
a data frame with n rows and p columns |
col.w |
a numeric vector containing the row weights |
row.w |
a numeric vector containing the column weights |
scannf |
a logical value indicating whether the eigenvalues bar plot should be displayed |
nf |
if scannf FALSE, an integer indicating the number of kept axes |
call |
generally |
type |
a string of characters : the returned list will be of class |
tol |
a tolerance threshold for null eigenvalues (a value less than tol times the first one is considered as null) |
full |
a logical value indicating whether all non null eigenvalues should be kept |
x, dudi, object |
objects of class |
... |
further arguments passed to or from other methods |
newnf |
an integer indicating the number of kept axes |
i,j |
elements to extract (integer or empty): index of rows (i) and columns (j) |
as.dudi and all the functions that use it return a list with the following components :
tab |
a data frame with n rows and p columns |
cw |
column weights, a vector with n components |
lw |
row (lines) weights, a vector with p components |
eig |
eigenvalues, a vector with min(n,p) components |
nf |
integer, number of kept axes |
c1 |
principal axes, data frame with p rows and nf columns |
l1 |
principal components, data frame with n rows and nf columns |
co |
column coordinates, data frame with p rows and nf columns |
li |
row coordinates, data frame with n rows and nf columns |
call |
original call |
Daniel Chessel
Anne B Dufour anne-beatrice.dufour@univ-lyon1.fr
Stephane Dray stephane.dray@univ-lyon1.fr
Escoufier, Y. (1987) The duality diagram : a means of better practical applications In Development in numerical ecology, Legendre, P. & Legendre, L. (Eds.) NATO advanced Institute, Serie G. Springer Verlag, Berlin, 139–156.
data(deug) dd1 <- dudi.pca(deug$tab, scannf = FALSE) dd1 t(dd1) is.dudi(dd1) redo.dudi(dd1,3) summary(dd1)