diff --git a/README.md b/README.md
index 738d7bd05..07e9a3e24 100644
--- a/README.md
+++ b/README.md
@@ -5,12 +5,19 @@ DRAFT Bay Area UrbanSim (BAUS) Implementation
 
 This is the DRAFT UrbanSim implementation for the Bay Area. Policy documentation for the Bay Area model is available [here](http://data.mtc.ca.gov/bayarea_urbansim/) and documentation for the UrbanSim framework is available [here](https://udst.github.io/urbansim/).
 
-* Install Python for your OS ([Anaconda](https://www.continuum.io/downloads) highly suggested)
-* Clone this repository
-* Install dependencies using `pip install -r requirements.txt` (may need to uncomment out pandana)
-* Get data using `python baus.py -c --mode fetch_data` (you will need an appropriately configured AWS credentials file which you must get from your MTC contact)
-* Preprocess data using `python baus.py -c --mode preprocessing`
-* Run a simulation using `python baus.py -c` (default mode is simulation)
+### Installation
+
+Bay Area UrbanSim is written in Python and runs in a command line environment. It's compatible with Mac, Windows, and Linux, and with Python 2.7 and 3.5+. Python 3 is recommended.
+
+1. Install the [Anaconda Python](https://www.anaconda.com/products/individual#Downloads) distribution (not strictly required, but makes things easier and more reliable)
+2. Clone this repository
+3. Download base data from this [Box folder](https://app.box.com/folder/52679598048) and move the files to `bayarea_urbansim/data/` (ask an MTC contact for access)
+3. Create a Python environment with the current dependencies: `conda env create -f baus-env-2020.yml`
+4. Activate the environment: `conda activate baus-env-2020`
+5. Pre-process the base data: `python baus.py --mode preprocessing` (only needed once)
+6. Run the model: `python baus.py`
+
+More info about the command line arguments: `python baus.py --help`
 
 ### An overview of baus.py
  
diff --git a/baus-env-2020.yml b/baus-env-2020.yml
new file mode 100644
index 000000000..ba95b96ea
--- /dev/null
+++ b/baus-env-2020.yml
@@ -0,0 +1,21 @@
+# This environment pins dependencies at specific versions, to ensure consistent model
+# behavior. It also pins some of the more important sub-dependencies.
+
+# Install this environment by running `conda env create -f baus-env-2020.yml`
+
+name: baus-env-2020
+
+channels:
+  - conda-forge
+
+dependencies:
+  - python=3.6
+  - numpy=1.17
+  - orca=1.5
+  - orca_test=0.1
+  - pandana=0.4
+  - pandas=0.25
+  - scikit-learn=0.22
+  - statsmodels=0.11
+  - urbansim=3.2
+  - urbansim_defaults=0.2
diff --git a/configs/neighborhood_vars.yaml b/configs/neighborhood_vars.yaml
index 17b0131a5..1fcebb148 100644
--- a/configs/neighborhood_vars.yaml
+++ b/configs/neighborhood_vars.yaml
@@ -68,7 +68,7 @@ variable_definitions:
     radius: 1500
     apply: np.log1p
     decay: flat
-    aggregation: average
+    aggregation: ave
 
   - name: ave_lot_size_per_unit
     dataframe: buildings
@@ -78,7 +78,7 @@ variable_definitions:
     radius: 1500
     apply: np.log1p
     decay: flat
-    aggregation: average
+    aggregation: ave
 
   - name: population
     filters:
@@ -116,7 +116,7 @@ variable_definitions:
     - building_id != -1
     varname: persons
     radius: 1500
-    aggregation: average
+    aggregation: ave
     decay: flat
     apply: np.log1p
 
diff --git a/requirements-2019.txt b/requirements-2019.txt
index 2ade63a7f..5d095121e 100644
--- a/requirements-2019.txt
+++ b/requirements-2019.txt
@@ -1,9 +1,11 @@
-# This environment pins requirements at their versions as of 10-2019
+# This environment pins requirements at their versions as of Oct-2019, updated Apr-2020
+# Compatible with both Python 2.7 and 3.6+
 
 # Install with: pip install -r requirements-2019.txt
 
-numpy == 1.17.*
-pandas == 0.25.*
+numpy == 1.16.*
+pandas == 0.24.*
+statsmodels == 0.10.*
 
 orca == 1.5.*
 orca_test == 0.1.*