NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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How to Examine External Validity Within an Experiment

Amanda E. Kowalski

NBER Working Paper No. 24834
Issued in July 2018
NBER Program(s):Development Economics, Health Care, Labor Studies, Public Economics, Technical Working Papers

A fundamental concern for researchers who analyze and design experiments is that the experimental result might not be externally valid for all policies. Researchers often attempt to assess external validity by comparing data from an experiment to external data. In this essay, I discuss approaches from the treatment effects literature that researchers can use to begin the examination of external validity internally, within the data from a single experiment. I focus on presenting the approaches simply using figures.

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Document Object Identifier (DOI): 10.3386/w24834

 
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