The compiler is the original source of data and different compilers will use different methods for gathering data. You have exact information (exact age for example) and you have modeled data that can be created from complex models that may include a variety of inputs. There is also information from utility changes, census data, surveys, subscription lists, courthouse records and others. Also, it is important to know how often records are compiled. Are they compiled only once a year and updated throughout the year or are they recompiled more frequently? The more frequent the more accurate your data will be. It is important for a compiler to run their data through the NCOA process several times a year for increased accuracy.
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