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  3. December 2013

Re: Where are the CORRELATION, VARIANCE, and COVARIANCE functions in IBM i DB2

This will not work on IBM i, which is the flavor of DB2 the OP is asking about.

Documentation for DB2 LUW (Linux-Unix-Windows) is generally not something I recommend to anyone running on IBM i. It will probably end up just confusing a person.

JMHO
Vern

On 12/3/2013 3:08 PM, Tom Stieger wrote:
Based on the links for DB2 LUW, the following should get you what you need.

WITH
avgcte as (SELECT AVG(exp1) as avgexp1, AVG(exp2) as avgexp2 FROM table1),
covarcte as (SELECT AVG((exp1 - avgexp1)*(exp2-avgexp2)) as covarvalue FROM
table1, avgcte),
corrcte as (SELECT covarvalue/(STDDEV(exp1)*STDDEV(exp2)) as corrvalue FROM
table1, covarcte)

SELECT * from avgcte, covarcte, corrcte

I can't test this out right now, but it looks like it might work to me.

-Tom Stieger


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