Snow, I hope you are not asking about mature companies such as Apple that have been around for a long time. You obviously should know that small, high growth companies is what I am taliking about. If you are talking about Mr. Softie, Apple, and the like, don't waste your time looking anything up.
Quite difficult for a multi-billion dollar company to grow at 15% or more. Your small companies, such as CKYS, will always carry a higher PE than a mature company.
A quick measurement for you would be simply if you had a small company growing at a certain percentage, double that for a realistic PE for the next couple of years.