this can either be an array, where each column is a series, or a vector of values. If x is an array of time series, then the importance of each series is calculated as the mean of the observations (sales volume). Otherwise, value can be whatever quantity is provided.
prc
a vector of percentages indicating how many items are included in each class. By default this is c(0.2,0.3,0.5), but any set of percentage values can be used as long as 0<=prc[i]<=1 and sum(prc)==1.
cex.prc
font size of percentages reported in plot.
...
additional arguments passed to the plot.
Value
Return object of class abc and contains:
value: a vector containing the importance value of each series.
class: a vector containing the class membership of each series.
rank: a vector containing the rank of each series, with 1 being the highest ranking series.
conc: the importance concentration of each class, as percentage of total value.