But a comparison with data for weeks when there was no experimentation showed that output always went up on Mondays.

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All data received from schools were subject to verification checks, including, where possible, comparison with historical data, peer schools and other published sources.

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But that data needs treating with caution. uSwitch, a comparison site that compiled the figures, says the data is based on sales plus deal popularity.

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"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.

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By comparison, in dealing with the vast realms of low-content data, just about the only way to cost-effectively refine down to the good stuff will be through high-powered data compression.

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And a comparison of the 72 American cities with a population over 250, 000, using data from the Federal Bureau of Investigation's Uniform Crime Reporting Program, reveals that some places are definitely more murderous than others.

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If you go back to 2005 data, a more expansive ILO regional comparison shows South Korea out of synch with Asia-Pacific, except for also- notoriously strike-prone India.

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