Depending on what exactly you want to do I would either do
Sorter, Aggregator (w/ count attribute and list), Deaggregator (part number, explode list), ExpressionEvaluator (some variant of part number/ count)
Or for more complicated analysis
StatisticsCalculator (histogram, complete port) followed by an ExpressionEvaluator (with possibly some list manipulation of the histogram prior to that)
After a few trials I found it might be much easier to do this in R, although that means that I have to switch between the two softwares. But thanks anyway.
Hi haow,
I know it's quite after some time but this might be what you (and others) are looking for - PercentileCalculator, custom transformer at FME Hub.