| 21. | The formaldehyde used as a preservative produces false negatives in both reactions.
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| 22. | So, what processes might cope with false negatives?
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| 23. | Investigators said the tests often produced false negative results.
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| 24. | False negatives are not allowed : a valid proof must always be accepted.
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| 25. | The tuberculin skin test fails due to the high numbers of false negatives.
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| 26. | The false negatives rate is 20-30 %.
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| 27. | Test against false " positives " as well as false negatives.
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| 28. | This may have resulted in less acid reflux and a false negative test.
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| 29. | Thus the DD algorithm can only create false negatives.
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| 30. | Grammars deduced from examples have the problems of false positives and false negatives.
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