Usage
PCA(x, scale., center, fac)
# S3 method for OutCoe
PCA(x, scale. = FALSE, center = TRUE, fac)
# S3 method for OpnCoe
PCA(x, scale. = FALSE, center = TRUE, fac)
# S3 method for LdkCoe
PCA(x, scale. = FALSE, center = TRUE, fac)
# S3 method for TraCoe
PCA(x, scale. = TRUE, center = TRUE, fac)
# S3 method for default
PCA(x, scale. = TRUE, center = TRUE, fac = dplyr::tibble())
as_PCA(x, fac)
Value
a 'PCA' object on which to apply plot.PCA, among others. This list has several
components, most of them inherited from the prcomp
object:
sdev
the standard deviations of the principal components (i.e., the square roots of the eigenvalues of the covariance/correlation matrix, though the calculation is actually done with the singular values of the data matrix)eig
the cumulated proportion of variance along the PC axesrotation
the matrix of variable loadings (i.e., a matrix whose columns contain the eigenvectors). The function princomp returns this in the element loadings.center
, scale the centering and scaling usedx
PCA scores (the value of the rotated data (the centred (and scaled if requested) data multiplied by the rotation matrix))other components are inherited from the
Coe
object passed toPCA
, egfac
,mshape
,method
,baseline1
andbaseline2
, etc. They are documented in the corresponding*Coe
file.
Details
By default, methods on Coe object do not scale the input data but center them. There is also a generic method (eg for traditional morphometrics) that centers and scales data.
Examples
bot.f <- efourier(bot, 12)
#> 'norm=TRUE' is used and this may be troublesome. See ?efourier #Details
bot.p <- PCA(bot.f)
bot.p
#> A PCA object
#> --------------------
#> - 40 shapes
#> - $method: [ efourier analysis ]
#> # A tibble: 40 × 2
#> type fake
#> <fct> <fct>
#> 1 whisky a
#> 2 whisky a
#> 3 whisky a
#> 4 whisky a
#> 5 whisky a
#> 6 whisky a
#> # ℹ 34 more rows
#> - All components: sdev, rotation, center, scale, x, eig, fac, mshape, method, cuts.
plot(bot.p, morpho=FALSE)
#> will be deprecated soon, see ?plot_PCA
plot(bot.p, 'type')
#> will be deprecated soon, see ?plot_PCA
op <- npoly(olea, 5)
#> 'nb.pts' missing and set to: 91
op.p <- PCA(op)
op.p
#> A PCA object
#> --------------------
#> - 210 shapes
#> - $method: [ npoly analysis ]
#> # A tibble: 210 × 4
#> var domes view ind
#> <fct> <fct> <fct> <fct>
#> 1 Aglan cult VD O10
#> 2 Aglan cult VL O10
#> 3 Aglan cult VD O11
#> 4 Aglan cult VL O11
#> 5 Aglan cult VD O12
#> 6 Aglan cult VL O12
#> # ℹ 204 more rows
#> - All components: sdev, rotation, center, scale, x, eig, fac, mshape, method, mod, baseline1, baseline2, cuts.
plot(op.p, 1, morpho=TRUE)
#> will be deprecated soon, see ?plot_PCA
wp <- fgProcrustes(wings, tol=1e-4)
#> iteration: 1 gain: 53084
#> iteration: 2 gain: 0.1323
#> iteration: 3 gain: 0.056732
#> iteration: 4 gain: 0.00012401
#> iteration: 5 gain: 0.038609
#> iteration: 6 gain: 0.018221
#> iteration: 7 gain: 0.0014165
#> iteration: 8 gain: 6.1489e-06
wpp <- PCA(wp)
wpp
#> A PCA object
#> --------------------
#> - 127 shapes
#> - $method: [ procrustes analysis ]
#> # A tibble: 127 × 1
#> group
#> <fct>
#> 1 AN
#> 2 AN
#> 3 AN
#> 4 AN
#> 5 AN
#> 6 AN
#> # ℹ 121 more rows
#> - All components: sdev, rotation, center, scale, x, eig, fac, mshape, method, cuts, links.
plot(wpp, 1)
#> will be deprecated soon, see ?plot_PCA
# "foreign prcomp"
head(iris)
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 1 5.1 3.5 1.4 0.2 setosa
#> 2 4.9 3.0 1.4 0.2 setosa
#> 3 4.7 3.2 1.3 0.2 setosa
#> 4 4.6 3.1 1.5 0.2 setosa
#> 5 5.0 3.6 1.4 0.2 setosa
#> 6 5.4 3.9 1.7 0.4 setosa
iris.p <- prcomp(iris[, 1:4])
iris.p <- as_PCA(iris.p, iris[, 5])
class(iris.p)
#> [1] "PCA" "prcomp"
plot(iris.p, 1)
#> will be deprecated soon, see ?plot_PCA