Oracle PL/SQL: COVAR SAMP - COVAR SAMP returns the sample covariance of a set of number pairs. Both expr1 and expr2 are numeric

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Snippet Name: COVAR_SAMP

Description: COVAR_SAMP returns the sample covariance of a set of number pairs. Both expr1 and expr2 are numeric expressions. Virtuoso applies the function to the set of (expr1, expr2) pairs after eliminating all pairs for which either expr1 or expr2 is null. Then Virtuoso makes the following computation:

(SUM(expr1 * expr2) - SUM(expr2) * SUM(expr1) / n) / (n-1)

where n is the number of (expr1, expr2) pairs where neither expr1 nor expr2 is null.

Also see:
» RANK
» REGR_SLOPE
» VARIANCE
» VAR_SAMP
» VAR_POP
» SUM
» STDDEV_SAMP
» STDDEV_POP
» STDDEV
» ROW_NUMBER
» REGR_SYY
» REGR_SXY
» REGR_SXX
» REGR_R2
» REGR_INTERCEPT
» REGR_COUNT
» REGR_AVGY
» REGR_AVGX
» Number Functions: RATIO_TO_REPORT
» Number Functions: RANK
» PERCENTILE_DISC
» PERCENTILE_CONT
» PERCENT_RANK
» OVER PARTITION BY
» NTILE
» MIN
» MAX
» LEAD
» LAST_VALUE
» LAST

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 02nd, 2009

COVAR_SAMP(<expression1>, <expression2>) OVER (<analytic clause>)
 
conn oe/oe
 
SELECT job_id,
COVAR_POP(SYSDATE-hire_date, salary) AS COVAR_POP,
COVAR_SAMP(SYSDATE-hire_date, salary) AS COVAR_SAMP
FROM employees
WHERE department_id IN (50, 80)
GROUP BY job_id;