# selecting trim/trunc lengths with dada2

**URL:** https://forum.qiime2.org/t/selecting-trim-trunc-lengths-with-dada2/18150
**Category:** User Support
**Tags:** dada2
**Created:** [January 20, 2021, 6:10am UTC](https://forum.qiime2.org/t/selecting-trim-trunc-lengths-with-dada2/18150 "2021-01-20T06:10:32Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![YuZhang](https://forum.qiime2.org/user_avatar/forum.qiime2.org/yuzhang/32/11537_2.png) [@YuZhang](https://forum.qiime2.org/u/YuZhang)
#### Post date: [January 21, 2021, 12:23am UTC](https://forum.qiime2.org/t/selecting-trim-trunc-lengths-with-dada2/18150/5 "2021-01-21T00:23:28Z")

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Thanks cherman,these are my data you nead.  
Could you tell me how to check the data is good through theses images？  
and could you help me take a look at my another post? Also relative DADA2.  
Thanks again.

> [@ITS data analysis : How to determine which dada2 analysis is the best](https://forum.qiime2.org/t/its-data-analysis-how-to-determine-which-dada2-analysis-is-the-best/18149):
>
> Dear all, I have some confuse in the the data2 of ITS data analysis. My prime is [image] The primes were removed. my demux image like this the score drop site is 168 in the left ,151 in the right My fist try in data2 is qiime dada2 denoise-paired --i-demultiplexed-seqs demux.qza --p-trim-left-f 0 --p-trim-left-r 0 --p-trunc-len-f 160 --p-trunc-len-r 140 --p-n-threads 40 --o-representative-sequences rep-seq-dada2.qza --o-table table-dada2.qza --o-denoising-st…

[rep-seq-dada2-3.qzv](https://forum.qiime2.org/uploads/short-url/4V6SRZoxnIV2JbooPUYdrTkoE4f.qzv) (7.1 MB) [stats-dada2-3.qzv](https://forum.qiime2.org/uploads/short-url/edBOB8Su2oVePC2AFy1KPV0ypzt.qzv) (1.2 MB) [demux.qzv](https://forum.qiime2.org/uploads/short-url/saw301xXn3ltjEaF41QYIYNVY1T.qzv) (288.3 KB)

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