This cross-validation yields a statistically valid estimate of accuracy and predicts the accuracy of a random bulls that could have been in the training dataset but was not.
But in secondary measures, Genasense did show a statistically valid improvement.
Administer the survey to a statistically valid sample of your school population, and tabulate the results.
Nancy Brown, Athenahealth's senior vice president for clinical service development, acknowledged that "it is not a statistically valid sample".
But so far, he said, the drug companies have not been able to prove their savings by doing a statistically valid analysis.
But the authors added that there were too few 8-year-olds who use booster seats to make a statistically valid comparison.
"We conduct a statistically valid survey of voters and do the data analysis to help the districts understand it.
Thus research, such as that unveiled by the National Centre for Social Research (NatCen) suggesting that 30% of a statistically valid sample identify as "a little" or "very" prejudiced, causes great discombobulation.
Under the Senate bill, importers would have to provide large amounts of data to the F.D.A. to show, for example, that a statistically valid sample of all drug shipments had been tested to ensure compliance with federal standards.
Mr. Russianoff said that the number of responses created a statistically valid sample, but he also said that the group "had to make some subjective judgments" about where to distribute the study.
This would culminate with a statistically valid review of the votes cast.The current voting system is broken throughout the United States.
