Shooting at Batman Movie in Denver
Another in what seems to be a horrific new aberration in modern society, mass shootings in schools, shopping malls, and now a movie theater. Nobody knows whether there is more to explain than crazy people emulating each other. It does seem to be a virulent strain of anti-social behavior. It shocks us repeatedly, perhaps even more than terrorist attacks in the Middle East.
One of the victims wrote movingly about an "odd feeling" that led her outside and to relative safety, just before a similar berserker shooting in a mall in Toronto. This is her blog entry.
From the Globe and Mail:
The GCP event was set for 6 hours beginning at the time of the shooting, which was 12:30 AM local (06:30 UTC). The result is Chisquare 21932.562 on 21600.000, for p = 0.055 and Z = 1.595.
It is important to keep in mind that we have only a tiny statistical effect, so that it is always hard to distinguish signal from noise. This means that every "success" might be largely driven by chance, and every "null" might include a real signal overwhelmed by noise. In the long run, a real effect can be identified only by patiently accumulating replications of similar analyses.