initial commit

.gitignore

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+tmp

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

Makefile

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+version="0.1.0"
+
+data:
+	python scripts/process.py
+
+.PHONY: data

README.md

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+Purchasing power parity (PPP)
+
+## Data
+
+### Description
+
+> Purchasing power parity conversion factor is the number of units of a country's currency required to buy the same amounts of goods and services in the domestic market as U.S. dollar would buy in the United States.[*][pa-nus-ppp]
+
+### Sources
+
+* PPP conversion factor, GDP (LCU per international $)
+    * Name: World Bank, International Comparison Program database.
+    * Web: http://data.worldbank.org/indicator/PA.NUS.PPP
+
+## Data Preparation
+
+### Requirements
+
+Data preparation requires Python 2. Required external Python modules are listed in the `requirements.txt` file in this directory.
+
+### Processing
+
+Run the following script from this directory to download and process the data:
+
+```bash
+make data
+```
+
+### Resources
+
+The raw data are output to `./tmp`. The processed data are output to `./data`.
+
+## License
+
+### ODC-PDDL-1.0
+
+This Data Package is made available under the Public Domain Dedication and License v1.0 whose full text can be found at: http://www.opendatacommons.org/licenses/pddl/1.0/
+
+### Notes
+
+Refer to the [terms of use][worldbank] of the source dataset for any specific restrictions on using these data in a public or commercial product.
+
+[pa-nus-ppp]: http://data.worldbank.org/indicator/PA.NUS.PPP 
+[worldbank]: []http://web.worldbank.org/WBSITE/EXTERNAL/0,,contentMDK:22547097~pagePK:50016803~piPK:50016805~theSitePK:13,00.html