Re \"Unalterables\"-- A par, by definition, is an average. An average, by definition, means the underlying data has NOT been constant. Using an average and calling it a constant doesn\'t make it one, and doesn\'t have any relevance to a specific case, but it sure makes it easy to come up with a figure.
I remember it well.
Now Jerry if you start talking standard deviations and six sigma......I will know the whole world has gone upside down....
NCT
Fortunately, you don\'t need to know that stuff to make figures.
You do, however, have to have a little common sense. But only if you want to get them right. If you want to SOUND like they are right, you use the word \"objective\" a lot when it has absolutely nothing to do with what you are talking about.