The regulator responsible for moderating A-level exam results ignored offers of expert help after statisticians refused to sign a highly-restrictive non-disclosure agreement, Sky News has learned.
Sky News has learned that the Royal Statistical Society (RSS) offered to help the regulator with the algorithm in April, writing to Ofqual to suggest that it take advice from external experts.
The RSS says it proposed two fellows to give assistance: Guy Nason, professor of statistics at Imperial College London, and Paula Williamson, professor of medical statistics at the University of Liverpool.
Ofqual agreed to consider the fellows, but only if the two academics signed a non-disclosure agreement (NDA) which prevented them from commenting in any way on the final choice of the model for five years after the results were released.
"We get the point of non-disclosure agreements: you don't want someone offering a running commentary while decisions are being made," said Sharon Witherspoon, vice president of the Royal Statistical Society for Education and Statistical Literacy.
"But constraining independent academic experts from saying, 'Well, looking at the data, I saw it was clear this would have this effect,' didn't fit our principles of transparency."
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The RSS wrote to Ofqual in what Ms Witherspoon said was "the most constructive way" raising its concerns about the NDA, but said it received no reply to its message, so the offer of expert help was never taken.
Ms Witherspoon said she believed independent expertise could have improved the A-level algorithm, which has been criticised for unfairly lowering students' grades based on schools' past performance.
"I do feel sorrow about it because I think this could have been averted," she told Sky News.
Stian Westlake, chief executive of the RSS, said that if Ofqual had been more open, the issues with the algorithm "would have been identified sooner".
"We could have helped Ofqual reassess the criterial," he said, citing the decision not to adjust the results for small numbers of students taking a particular subject at a school, a move is believed to have favoured private and selective schools.
"Even if Ofqual decided they didn't want to change anything, greater transparency would have helped the Department for Education prepare for the response to their decisions."
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