jwdebelius
(Justine Debelius)
August 10, 2021, 3:38pm
5
Hi @YuZhang ,
This is more a note of caution about your design and being careful with your beta diversity.
There isn't a good solution for this problem after samples have been collected and sequenced. The best time time to solve this is during the experimental design phase. The tests carry the sample size limitations they have and you're ultimately paying an FDR penalty if you're doing untargeted testing.
If you run into the isssue when you get there, here are a few threads on the subject
I am new to running ANCOM and in my analysis I am comparing 2 groups of participants gut microbiome. I ran ANCOM and the results showed all w=0. I filtered minimum frequency to 10 as a previous post suggested.
I ran ANCOM on a set of data that had min samples of 2 and a min frequency of 10 (recommended from the “ANCOM giving strange W values” thread) and I’m still getting W scores of 0. Should I be taking these low scored taxa as significantly different in my analysis?
Hi,
I'm analyzing a set of samples of COPD patients and Healthy controls, and I've performed ANCOM to assess the differential abundant phyla between the two groups.
These are the results that I've obtained.
|k__Bacteria;p__Proteobacteria |3|
|k__Bacteria;p__Spirochaetes |2|
|k__Bacteria;p__Firmicutes |1|
|k__Bacteria;p__Synergistetes |1|
|k__Bacteria;p__Verrucomicrobia |1|
|k__Bacteria;p__Actinobacteria |0|
|k__Bacteria;p__Bacteroidetes |0|
|k__Bacteria;p__Chloroflexi |0|
|k__Bacteria…
Hello all,
My ANCOM results show that it rejects null hypothesis at many W values that are zero.
I'm not sure if this is a bug or something else?
(I read somewhere else in this forum that this is not supposed to happen)
Please kindly find attached the results:
ANCOM_level2.qzv (427.7 KB)
ANCOM_level6.qzv (448.4 KB)
Also, a higher W value means that it's more statistically significant, am I right?
But does this mean that I can compare W values at different levels?
For example, if taxa A …
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