ArchiveApril 2014

The quest for randomness

One of my favorite Dilbert cartoons features a lizardlike creature that’s billed as a “random number generator,” but that only ever seems to spit out the number nine. Dilbert asks his guide, “Are you sure that’s random?” The guide replies, “That’s the problem with randomness. You can never be sure.” It’s funny (at least to me), but is it true? Can you ever be reasonably sure that something is...

Power analyses for matching

A colleague at RTI asked me about power analyses for PSM, specifically, should he assume dependent samples for his power analysis? Recall that with dependent samples, we pair observations at the analysis stage. For example, we might calculate the change over time for two observations of the same individual, or compare husbands’ and wives’ perception of their marriages. With matching...

In defense of the SAT

Takes on popular myths that the SAT does not predict college success, is only driven by socio-economic status, etc.:
Yes, IQ Really Matters

In blind test, soloists like new violins over old

Ten world-class soloists put costly Stradivarius violins and new, cheaper ones to a blind scientific test. The results may seem off-key to musicians and collectors, but the new instruments won handily. When the lights were dimmed and the musicians donned dark glasses, the soloists’ top choice out of a dozen old and new violins tested was by far a new one. So was the second choice, according...

RCT training opportunity

I attended this several years ago, and it is an excellent training opportunity:
2014 Summer Research Training Institute on Cluster-Randomized Trials

About me


Professor and quant guy. Libertarian turned populist Republican. Trying to learn Japanese and play Spanish Baroque music on the ukulele.

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