Finally, about 18% of requests involved Microsoft handing over no data at all, said the report, either because there was no data to be found or the request was not submitted properly.
"They've only got data on this final slice of the process, but they are still missing crucial parts of the criminal-justice process, " said Sonja Starr, a law professor at the University of Michigan, who has analyzed sentencing and arrest data and found no marked increase in racial disparity since 2005.
Facebook has revealed it was the target of a "sophisticated attack" by hackers last month, but found no evidence any user data had been compromised.
"I also found that no thorough comparison of data from controlled archive cases was undertaken with other government departments or financial institutions in order to trace applicants until April 2012, " he said.
Based on historic data, there have been no discernible trends or patterns found between antibiotic resistance and the numbers reported in each group.
Upon examination of data from the Chandra telescope, however, researchers found no sign of one.
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There is no data in this study that indicate that the levels of flame retardants found would cause any human health problems.
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Although a mass of data was discovered on computer hard drives, no weapons or explosives were found.
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But when Khan reviewed all the data from FDA approval trials of all the antidepressants he found no difference in suicide and suicidal behavior rates among patients who got antidepressants and those who got placebo.
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When researchers combined data from the 168 young people in these four studies, they found no evidence that homeopathic treatments were of benefit for ADHD.
For a lot of reasons, no company reliant on Internet ads has yet found an acceptable way to collect as much click-predicting data from mobile searches.
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