"It might just be a statistical artifact," Professor Baldus said.
But a raft of evidence now suggests that the migraine finding, though intriguing, was less fact than statistical artifact.
Over the past few years, scientists have opened the black box to investigate the brain itself, not a statistical artifact.
This even let some authors argue that it was a statistical artifact.
"The idea that this effect is a statistical artifact or not real is nonsense," said David Leon, an editor at the International Journal of Epidemiology.
In this study, we controlled the statistical artifact of multiple comparisons (type II error) by choosing a very conservative significance threshold (p < 0.000001).
Some of the acceleration might be a statistical artifact of the unusually mild winter, so far, in the eastern United States, which has probably led to fewer layoffs than usual in construction and other seasonally affected businesses.
"It confirms for most of us the notion that the 0.6percentt first-quarter G.D.P. was more statistical artifact than dangerously close to recession," said Robert J. Barbera, chief economist of ITG, an investment advisory firm.
Now, this effect could be nothing more than a statistical artifact; a game-by-game analysis of the thirty-one cases would undoubtedly help to reveal the losses' true causes.
We demonstrate that the highly unstable and erratic behavior that is typically observed for the correlation among financial assets is to a large extent a statistical artifact.
In addition, he provides a general account of hyperdiversity, confirming that it is not a statistical artifact but a genuine biological phenomenon that can best be understood by detailed analyses of groups of organisms such as the Pheidole ants.
