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R H's avatar

While a "cluster" is indeed used to refer to a statistical anomaly without making any claim about causation, there are unique aspects of a suicide cluster that make an asserted suicide cluster more unsettling.

Suicide is contagious, and the contagion is carried by news of the death. Even hearing about a fictional suicide can trigger follow-along suicides (Werther Effect). On one hand, that means suicides are intentionally underreported out of concern for those who might react to the news with their own suicide. On the other hand, it means suicide clusters often don't have an external cause, just an initial case triggering a chain reaction.

And there's the ethical question: will our reporting about the suicides lead some who otherwise would not, to their own suicide?

Zandela Omorogie's avatar

One distinction worth adding to this methodology is event date versus public-observability date.

The Cyber Command/DVIDS example makes it unusually clear: the mental-health open house occurred May 11 and clinical care began May 12, but the DVIDS account was posted June 26.

For retrospective analysis, those dates cannot be treated as interchangeable.

What an institution knew or was doing internally is different from what an external analyst could actually have known at the time.

Preserving that boundary helps prevent hindsight from making an earlier signal look more predictive than it really was.

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