# About qiime metadata tabulate

**URL:** https://forum.qiime2.org/t/about-qiime-metadata-tabulate/7383
**Category:** User Support
**Created:** [December 11, 2018, 1:18pm UTC](https://forum.qiime2.org/t/about-qiime-metadata-tabulate/7383 "2018-12-11T13:18:19Z")
**Posts on this page:** 1
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### Author: ![Nicholas\_Bokulich](https://forum.qiime2.org/user_avatar/forum.qiime2.org/nicholas_bokulich/32/19937_2.png) [@Nicholas\_Bokulich](https://forum.qiime2.org/u/Nicholas_Bokulich)
#### Post date: [December 11, 2018, 1:51pm UTC](https://forum.qiime2.org/t/about-qiime-metadata-tabulate/7383/2 "2018-12-11T13:51:12Z")

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> [@F18D029G](#):
>
> Is the “Confidence” value of this assignment worthy of trust?

You can adjust the confidence threshold for classification. The default settings have been benchmarked for optimal performance.

However, those confidence values probably are not trustworthy. If every single classification is "Glomus", I suspect something is wrong with your classifier. Did you use `extract-reads` on the reference sequences by any chance? See [this topic](https://forum.qiime2.org/t/wrong-taxonomy-qzv-file/5287) — and note that `extract-reads` has a min-length parameter to fix that issue in the latest release of QIIME 2.

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