Category Archives: Uncategorized

DASL Updated. Mostly improved.

The Data and Story Library, originally hosted at Carnegie-Mellon, was a great resource for data for many years. But it was unsupported, and was getting a bit long in the tooth. The good people at Data Desk have refurbished it … Continue reading

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The Index of Clumpiness, Part Four: One-dimensional with bins

In the last three posts we’ve discussed clumpiness. Last time we studied people walking down a concourse at the big Houston airport, IAH, and found that they were clumped. We used the gaps in time between these people as our … Continue reading

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The Index of Clumpiness, Part Three: One Dimension

In the last two posts, we talked about clumpiness in two-dimensional “star fields.” In the first, we discussed the problem in general and used a measure of clumpiness created by taking the mean of the distances from the stars to … Continue reading

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Talking is so not enough

We’re careening towards to the end of the semester in calculus, and I know I’m mostly posting about stats, but this just happened in calc and it applies everywhere. We’ve been doing related rate problems, and had one of those classic … Continue reading

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Quick Check-in

Okay: one class down, 27 to go. The big problem right now is scheduling “lab” time, and extra hour a week that will make up the rest of the time we need to get through the material and learn the … Continue reading

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Teaching Stats Again

It’s Sunday. On Thursday, Math 102—Statistics and Probability—has its first meeting at Mills College, and I am allegedly in charge. This is a one-semester course, and at the college level, calculus required, in contrast to the year-long, high-school, non-AP classes … Continue reading

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Hanging Slinky Analysis 2: The Pre-Tension Wrinkle

Last time, we saw how the length of a hanging slinky is quadratic in the the number of links, namely, , where M is the mass of the hanging part of the slinky, g is the acceleration of gravity, and is the … Continue reading

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Irresistable

Coincidence? Sure hope so. But, NCTM, how could you not notice?

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Reflection on Modeling

I’m writing a paper for a book, and just finished a section whose draft is worth posting. For what it’s worth, I claim here that the book publisher (Springer) will own the copyright and I’m posting this here as fair … Continue reading

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Disagreeing with xkcd

Let us set stats education aside for a moment and make a cultural comment: With great respect, xkcd has it wrong: a couple usually means either 1 or 3. From your youth: How long did you work on your homework? … Continue reading

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