clusterify function

Group Elementary Series Using W-correlation Matrix

Group elemenatry series automatically via the hierarchical clustering with w-correlation matrix as a proximity matrix

## S3 method for class 'ssa'
grouping.auto.wcor(x, groups, nclust = length(groups) / 2, ...)

Arguments

• x: SSA object
• groups: list of numeric vectors, indices of elementary components used for reconstruction
• nclust: integer, desired number of output series
• ...: further arguments passed to hclust

Returns

List of integer vectors holding the indices of the elementary components forming each grouped objects

Details

Standard hclust routine is used to perform the grouping of the elementary components. See Algorithm 2.15 in Golyandina et al (2018) for details.

References

Golyandina N., Korobeynikov A., Zhigljavsky A. (2018): Singular Spectrum Analysis with R. Use R!. Springer, Berlin, Heidelberg.

See Also

hclust, wcor

Examples

# Decompose 'co2' series with default parameters
s <- ssa(co2)
# Form 3 series from the initial 6 ones:
lst <- grouping.auto(s, grouping.method = "wcor",
                     groups = 1:6, nclust=3)
# Automatic grouping:
print(lst)
plot(lst)
# Check separability
w <- wcor(s, groups = lst)
plot(w)