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...can't "explain" ALL the variances, but these 'variables' came to mind:
• differences in wind velocity
• differences in wind direction
• differences in driver control (we're seldom 100% repeatable)
• differences in air temperature
• differences in air density (cold/dry winter vs. hot/humid summer)
• differences in GPS satellite lock-on's (jumping between different satellites?)
...individually, these might be small, but their "interactions" might be significant?!?
...what kind of regression correlation coefficent (R^2) do you get when you tell the Trendline function to "set intercept = 0", which forces the "average" line to go through zero at Y = X = 0.
Last edited by gone-ot; 12-21-2011 at 06:42 PM..
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