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He conducted a national survey in 1994 (the National Self-Defense Survey) and, extrapolating from the 5,000 households surveyed, estimated that....
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Why don't you quote as above (as it is written in wikipedia) with the
extrapolated and
estimated?
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A study of gun use in the 1990s, by David Hemenway at the Harvard Injury Control Research Center, claimed that criminal use of guns is far more common than self-defense use of guns...
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From the same wiki page.
So what made Gary Kleck's National Self-Defense Survey fact but not David Hemenway's from Harvard??