align_median: object from curve_karcher_mean() of aligned curves using the median
alpha: quantile value (default=.05, i.e., 95%)
ka: scalar for outlier cutoff (default=1)
Returns
Returns an curvebox object containing:
median_y: median curve
Q1: First quartile
Q3: Second quartile
Q1a: First quantile based on alpha
Q3a: Second quantile based on alpha
minn: minimum extreme curve
maxx: maximum extreme curve
outlier_index: indexes of outlier curves
fmedian: median curve
References
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.