This notebook creates a jackknifed PCoA plot based on multiple rarefactions.

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%matplotlib inline
from emperor import Emperor, nbinstall

nbinstall()

from skbio.stats.ordination import pcoa
from skbio.diversity import beta_diversity

from biom import load_table

# pydata/scipy
import pandas as pd
import numpy as np

def load_mf(fn, index='#SampleID'):
    _df = pd.read_csv(fn, sep='\t', dtype=str, keep_default_na=False, na_values=[])
    _df.set_index(index, inplace=True)
    return _df

We are going to load data from Fierer et al. 2010 (the data was retrieved from study 232 in Qiita, remember you need to be logged in to access the study).

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mf = load_mf('keyboard/mapping-file.txt')
bt = load_table('keyboard/otu-table.biom')
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import emperor
emperor.__file__

Create 5 rarefactions and compute the Jaccard distance matrix for each resulting table.

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ordinations = []
for r in range(5):
    rarefied = bt.subsample(1000)
    data = np.array([rarefied.data(i) for i in rarefied.ids()], dtype='int64')
    
    res = pcoa(beta_diversity('jaccard', data, rarefied.ids()))
    
    ordinations.append(res)

Jackknifed plots need a master set of coordinates where there rest of the matrices will be centered around.

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master = ordinations[0]
jackknifed = ordinations[1:]

If you want to share your notebook via GitHub use remote=True and make sure you share your notebook using nbviewer.

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Emperor(master, mf, jackknifed=jackknifed, remote=False)
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