Data Sources from the Federal Government

- WordCounter analyzes your text and tells you the most common words and phrases.
- SameDiff compares two or more text files and tells you how similar or different they are.
- WTFcsv provides the first step in understanding your data by characterizing each column's data type and contents so that you can ask more questions.

It can, for example, tell you with which county or counties each ZIP code in the state of California shares population. It can tell you, for each of those ZIP/county intersections, what the size of that intersection is (based on 1990 population or other user-specifed variable) and what portion of the ZIP's total population is in that intersection.
The output files created by this application are referred to as "correlation lists". Other commonly used terms for such entities are "equivalency files", "crosswalk files", and "geographic correspondence files". A correlation list consists of a set of "source geocodes" specifying the geographic coverage to be related (i.e the "known" geographic coverage), and a set of "target geocodes" specifying the geographic coverage to which we want to relate the source areas.