# classify.otu bootstrap too high

**URL:** <https://forum.mothur.org/t/classify-otu-bootstrap-too-high/904>\
**Category:** mothur bugs\
**Created:** [May 15, 2012, 8:46am UTC](https://forum.mothur.org/t/classify-otu-bootstrap-too-high/904 "2012-05-15T08:46:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kirk](https://avatars.discourse-cdn.com/v4/letter/k/f9ae1b/32.png) [@Kirk](https://forum.mothur.org/u/Kirk)\
**Post date:** [May 15, 2012, 8:46am UTC](https://forum.mothur.org/t/classify-otu-bootstrap-too-high/904/1 "2012-05-15T08:46:58Z")

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Hi,

some of my bootstrap values are over 100 (up to 200) when clustering at 0.01. How is this possible? I should mention it are unknown sequences at the domain level.

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**Author:** ![westcott](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.mothur.org/westcott/32/18_2.png) [@westcott](https://forum.mothur.org/u/westcott)\
**Post date:** [May 15, 2012, 12:04pm UTC](https://forum.mothur.org/t/classify-otu-bootstrap-too-high/904/2 "2012-05-15T12:04:07Z")

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Thanks for bringing this to our attention. The confidence score is calculated as follows ceil((numberOfSeqsWithConsensusTax / totalNumberOfSeqs) \* 100). Mothur mistakenly added 1 to numberOfSeqsWithConsensusTax in the special case of “unknown”. This will be fixed in the next release.