Summary of Crosier: John Snow -- Adam Brown, BYU Political Science

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Crosier: John Snow

Disclaimer. Don't rely on these old notes in lieu of reading the literature, but they can jog your memory. As a grad student long ago, my peers and I collaborated to write and exchange summaries of political science research. I posted them to a wiki-style website. "Wikisum" is now dead but archived here. I cannot vouch for these notes' accuracy, nor can I say who wrote them.

Crosier. 2003. John Snow: The London Cholera Epidemic of 1854. from course CD, originally from a web site..

Problems:

nonrandom selection
mortality threat: all the sick people died
regression to the mean
thus, can't conclude that vapors don't cause cholera.

If nature gives us a natural experiment, how do we know whether it is roughly random? (1) the subjects don't know which group they were assigned to, (2) we don't either. The cholera experiment looks close enough to this test.

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Tags

Crosier, Scott (author) • Research Methodology • Research Design • Experiment

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