COVAR_POP Function | Teradata Vantage - 17.10 - COVAR_POP - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

Returns the population covariance of its arguments for all non-null data-point pairs.

For the COVAR_POP window function that performs a group, cumulative, or moving computation, see Window Aggregate Functions.

Covariance

Covariance measures whether or not two random variables vary in the same way. It is the average of the products of deviations for each non-null data point pair.

Note that high covariance does not imply a causal relationship between the variables.

Computation

When there are no non-null data point pairs in the data used for the computation, then COVAR_POP returns NULL.

Division by zero results in NULL rather than an error.