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John S,

This is a case where the use of color might be helpful. I realize the crosses are the European area and the dots are the U.S., but it's still somewhat difficult to make out. Maybe make one line blue and the other red?

Kaiser

I have a love-hate relationship with colors. I like sparing use to make specific points; this particular case could count as that.

That said, it is easy to abuse colors. Also, while we still have lots of grayscale printers and copiers in use, I tend to err on the safe side.

And diverging even more... I like the feature in PowerPoint where you can preview what a slide looks like in grayscale. I love this feature although I don't make use of it much. I don't know why.

Andrew Gelman

I agree on the colors. Also I'd alter both axes:

x-axis: Just put labels at 1995, 2000, 2005. This gives a better perspective on the time period. (It would be even better to go back another 10 yrs or so.)

y-axis: Again, no need to label all those tick marks. I'd just label 0, 2%, 4%.

Also, I'd extend the y-axis just a bit below zero (with a dotted line at the reference line of 0). I say this because GDP growth can be negative. The "hard boundary" at 0 in the graph gives the implicit visual impression that y can only be positive.

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