Important cases where the computational definition of R2 can yield negative values, depending on the definition used, arise where the predictions which are being compared to the corresponding outcomes have not been derived from a model-fitting procedure using those data, and where linear regression is conducted without including an intercept.

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But other doctors, especially oncologists used to the rigorous standards of proof required for big drug trials, note a lack of controlled trial data showing that the procedure extends life.

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And it is -- part of their procedure is to constantly review information and data that comes in, to review incidents that happen around the world.

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Apple issued a statement saying nothing was done with the data and has now changed the installation procedure so iTunes users get an early warning of what the MiniStore does.

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Unless ablation's backers can produce hard data showing how well it works, the procedure may continue to be a bit of an orphan.

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"We've asked the court to implement a procedure for all consumers, not just our client, to recover their data, " the EFF told technology news site Ars Technica.

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Proponents and skeptics alike agree on the need for data from randomized controlled trials to provide better information to guide use of the new procedure.

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That happened, the people said, after Bloomberg tested its computer system at an embargo procedure known as a "lockup" and found a flaw that could allow reporters to deliver data before the end of the embargo period.

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He added it appeared that the authors had not compared their sperm data and fertility rates with those of infertile men with varicoceles who did not have the embolisation procedure.

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