The Losada ratio is also known as the positivity ratio, Gottman ratio, and Losada line. The Losada ratio is the sum of the positivity in a system divided by the sum of its negativity. A ratio of 3.0 to 6.0 has been found to be highly correlated with high performance. The theory came from the field research of psychologist of Marcial Losada and relationship analysis of John Gottman.
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