There are different kinds of heuristic. The finding that people tend to incorrectly conclude that more people die from tornados than from asthma has been explained in terms of the availability heuristic.
The availability heuristic is known to the the point at which recent memories are given greater importance or greater consideration in decision making. This is often due to the recency effect.
An example of availability heuristic is train accidents and is often when people hear about horrendous train accidents or explosions that kill many people.
The availability heuristic shows us how the likelihood of a person to use information that comes to mind.
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