Box-Percentile Plot. The sides of the box-percentile plot encodes the information of a percentile plot, which
is equivalent to the empirical cumulative distribution function.
The input argument can be a cell array of samples (used when sample sizes are different) or an n by p matrix X.
The optional input argument 'VW' will construct variable width plots, where the maximum width is proportional
to the square root of the sample size.
None
boxprct(x,'vw')
Reference: "The box-percentile plot," by Esty and Banfield, Journal of Statistical Software, www.jstatsoft.org.