Elastic SPM Phase II Monitoring

Monitors new functional data against an elastic SPM chart. New curves are aligned to the Karcher mean, then amplitude (and optionally phase) are monitored separately.

Usage

spm.elastic.monitor(chart, newdata)

Arguments

chart

An object of class spm.elastic.chart from spm.elastic.phase1.

newdata

An object of class fdata with new observations.

Value

A list with components:

amplitude

List with t2, spe, t2.alarm, spe.alarm, scores

phase

List with t2, spe, t2.alarm, spe.alarm, scores (if monitor.phase = TRUE), or NULL

aligned.data

Matrix of aligned curves

warping.functions

Matrix of estimated warping functions

See also

spm.elastic.phase1 for building the chart

Examples

# \donttest{
set.seed(1)
n <- 40; m <- 30
argvals <- seq(0, 1, length.out = m)
X <- matrix(rnorm(n * m), n, m)
fd <- fdata(X, argvals = argvals)
chart <- spm.elastic.phase1(fd, ncomp = 3, warp.ncomp = 2)

X_new <- matrix(rnorm(10 * m) + 1, 10, m)
fd_new <- fdata(X_new, argvals = argvals)
mon <- spm.elastic.monitor(chart, fd_new)
mon$amplitude$t2.alarm
#>  [1] FALSE  TRUE FALSE FALSE  TRUE  TRUE FALSE FALSE  TRUE  TRUE
# }