This function constructs the amplitude boxplot.
ampbox_data(warp_median, alpha = 0.05, ka = 1)
Returns an ampbox
object containing:
median_y
: median function
Q1
: First quartile
Q3
: Second quartile
Q1a
: First quantile based on alpha
Q3a
: Second quantile based on alpha
minn
: minimum extreme function
maxx
: maximum extreme function
outlier_index
: indexes of outlier functions
fmedian
: median function
fdawarp object from time_warping()
of aligned data using
the median
quantile value (default=.05, i.e., 95%)
scalar for outlier cutoff (default=1)
Xie, W., S. Kurtek, K. Bharath, and Y. Sun (2016). "A geometric approach to visualization of variability in functional data." Journal of the American Statistical Association in press: 1-34.