This doesn't make sense to me. Why does the regression line have its own variable?I understand the trend without the addition of variable A: that staying out of trouble means more money for Phelps, and that less money is made when trouble increases. If you wanted to graph the interaction of 3 separate variables, you would need a 3-dimensional chart. Or you could graph Free Time vs. Income, and Free Time vs. Trouble in two separate graphs.
Send me one and I will post it. :-)
I always say that my readers are smarter than i am, hence, I feel so stupid; so to get it right, I gotta redo this graph tomorrow.
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