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Jon Peltier

-0.03? So R-squared is much less than 1%. Pretty tenuous. Also, you have three points in favor of a downward slope and two in favor of upwards, but one of those downward points would be touching the quadrant divider if the marker were a little larger. You could almost draw a circle connecting all the points.

We really need more cities, and more paired measurements, to say anything meaningful about the relationship.

Jon Peltier

I took the analysis sideways, and replotted my chart based on the assumption that there was some correlation (essentially plotting the diagonals of my boxes, rather than the centroids Kaiser plotted):

http://peltiertech.com/Excel/Commentary/HorridStuff.html

Why not? It's snowing and sleeting here (central Massachusetts), school is canceled and nobody's going anywhere, and it takes only two seconds to copy a sheet and delete a few rows.

Food for thought.

derek

My monkey brain insists on seeing a pattern to the rise and fall, either two straight lines or a parabola. But with only five points of dubious accuracy, there's probably nothing really there.

Kaiser

I think we can all agree on the conclusion that five samples are not enough to make reliable inference.

My graph was intended to illustrate a neat way to visualize the concept of correlation. Nothing more than that!

derek

I'm not having a go at anybody. I'm sorry if you feel like you're being piled on.

Kaiser

Derek, don't worry. I wrote that comment just to make sure that the point of the posting was not lost.

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