How on Earth did you come up with these?  I assume you were using data compiled in Excel spreadsheets and some automated technique, but... 
OK, I admit it, I'm 
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				not familiar with multiple regression 
			
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I have to wonder how well a forumla with negative coefficients for strength, encumbrance, and precision will predict the value of future units...  but since you out-math me, I'll gracefully bow before you 
