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biocore · Aug 23, 2016 · 13ccf0d · 13ccf0d
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diff --git a/ipynb/88soils.ipynb b/ipynb/88soils.ipynb
@@ -6,6 +6,8 @@
    "source": [
     "[Previous](https://github.com/biocore/gneiss/blob/master/ipynb/balance_trees.ipynb) \n",
     "\n",
+    "[Next](https://github.com/biocore/gneiss/blob/master/ipynb/88soils.ipynb) \n",
+    "\n",
     "In this study, there were 88 soil samples collected from North and South America.  Each of these soil samples had a pH measurement. From this [paper](http://www.ncbi.nlm.nih.gov/pubmed/19502440), it was observed that pH plays a primary role in community assemblage.  Here, we will show that pH by itself can actually predict the microbial abundances, using balance trees."
    ]
   },

diff --git a/ipynb/cfstudy.ipynb b/ipynb/cfstudy.ipynb
@@ -4,6 +4,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "[Previous](https://github.com/biocore/gneiss/blob/master/ipynb/88soils.ipynb)\n",
+    "\n",
     "In this study, there were 18 patients with cystic fibrosis.  The hypothesis was that there were two main communities at play in the CF lung.  One of these communities thrives at low pH, and the other community thrives at high pH.  To test this, sputum samples were divided among 8 tubes, and each of the tubes was perturbed with a different pH.  Here we will calculate balances, and test how these balances change with respect to pH, using linear mixed effects models."
    ]
   },