11. Spatial Data Analysis

“Of all the gin joints in all the towns in all the world, she walks into mine.”

—HUMPHREY BOGART AS RICK BLAINE IN Casablanca (1942)

At 2 a.m. in Madison, Wisconsin in the middle of January, the temperature is well below freezing. The bars close and hundreds of partially to fully inebriated students stream onto State Street. Walking more than a few blocks in the cold weather is difficult, even for those who have not been drinking. It makes no sense to call a cab—the wait time is too long. But, if students walk a block or two from State Street, they might find a cab or two.

For the cabbie, this is the best of all worlds—many potential passengers with limited interest in walking. The cabbie can drive around until someone ...

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