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A doubled upright stroke pair, denying any statistical relation.
Also known as: Perp sign, Statistical independence, Double up tack
The independence sign says two random variables carry no information about each other. It is written as two upside-down T shapes joined, and is one of the few notations in statistics with no widely used spelled-out alternative.
States that two random variables are statistically independent: knowing one changes nothing about the distribution of the other.
Contexts: Mathematics
Is extended with a vertical bar and a third variable to state conditional independence, which is a strictly different claim.
Contexts: Mathematics
Two upside-down T shapes standing side by side and sharing a horizontal base line.