NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Emptying the Tank: Getting the most out of Limited Data

M. Scott Taylor

NBER Working Paper No. 24855
Issued in July 2018
NBER Program(s):The Environment and Energy Program

All empirical researchers know that having more sources of variation in a dataset is valuable. What is not known is how valuable, and if the marginal value of adding another source of variation diminishes or increases. This note provides explicit answers to these questions. It defines "valuable" as the number of independent questions the data can potentially answer, and provides a surprisingly simple and useful rule that tells the researcher not only when they have "emptied the tank" of their data's valuable implications, but also the marginal value of further data collection. An illustration using home heating costs is provided.

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Document Object Identifier (DOI): 10.3386/w24855

 
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