Hi there
I am new to this group, and was wondering if there is any way 
  to replicate in Amibroker what the function PERCENTILERANK does in 
  Excel.
Basically, I have an array, and I want to compare a specific 
  value (i.e. the value of an oscillator), to its ranks in the array..
Is 
  there a shortcut to do this? what I have been doing is exporting the values of 
  the oscillator (using an explore) to an Excel spreadsheet, and then doing 
  PERCENTILERANK there; which is very time consuming.
THanks in advance 
  for any help.
Cheers,