[amibroker] Percentile Rank of P/S Ratio

[sendfreetest]

Hi,

I really need coding assistance.

I am attempting to code into AmiBroker Charles Kirkpatrick's
trading methodology for testing.

Kirkpatrick creates a percentile rank of stocks' price-to-sales
ratio and uses it as a filter. He purchases only stocks 
with a percentile rank between the 17th and 42nd level.

When a stocks price-to-sales percentile rank goes above 67
he sells.

With AmiBroker's PERCENTILE function it seems to evaluate
only one market's array to determine the percentile.

Is their an AmiBroker funtion to evaluate say 100+ 
stocks P/S Ratio and give each a percentile rank.

Thanks in advance for any help.

Abbie