CORR¶
Returns the Pearson correlation coefficient of value pairs.
Syntax¶
-- As an aggregate
CORR( expr1, expr2 )
-- As a window function
CORR ( expr1, expr2 ) OVER (
[ PARTITION BY partition_expr [, ...] ]
[ ORDER BY order [ ASC | DESC ] [, ...]]
)
Arguments¶
Parameter |
Description |
|---|---|
|
Numeric expression |
Returns¶
Returns the Perason correlation coefficient with type DOUBLE.
Notes¶
When all rows contain
NULLvalues, the function returnsNULL.
Examples¶
For these examples, assume a table named nba, with the following structure:
CREATE TABLE nba
(
"Name" text,
"Team" text,
"Number" TINYINT,
"Position" TEXT,
"Age" TINYINT,
"Height" TEXT,
"Weight" REAL,
"College" TEXT,
"Salary" FLOAT
);
Here’s a peek at the table contents (Download nba.csv):
Name |
Team |
Number |
Position |
Age |
Height |
Weight |
College |
Salary |
|---|---|---|---|---|---|---|---|---|
Avery Bradley |
Boston Celtics |
0.0 |
PG |
25.0 |
6-2 |
180.0 |
Texas |
7730337.0 |
Jae Crowder |
Boston Celtics |
99.0 |
SF |
25.0 |
6-6 |
235.0 |
Marquette |
6796117.0 |
John Holland |
Boston Celtics |
30.0 |
SG |
27.0 |
6-5 |
205.0 |
Boston University |
|
R.J. Hunter |
Boston Celtics |
28.0 |
SG |
22.0 |
6-5 |
185.0 |
Georgia State |
1148640.0 |
Jonas Jerebko |
Boston Celtics |
8.0 |
PF |
29.0 |
6-10 |
231.0 |
5000000.0 |
|
Amir Johnson |
Boston Celtics |
90.0 |
PF |
29.0 |
6-9 |
240.0 |
12000000.0 |
|
Jordan Mickey |
Boston Celtics |
55.0 |
PF |
21.0 |
6-8 |
235.0 |
LSU |
1170960.0 |
Kelly Olynyk |
Boston Celtics |
41.0 |
C |
25.0 |
7-0 |
238.0 |
Gonzaga |
2165160.0 |
Terry Rozier |
Boston Celtics |
12.0 |
PG |
22.0 |
6-2 |
190.0 |
Louisville |
1824360.0 |
Simple correlation¶
t=> SELECT "Team", CORR("Age","Salary") FROM nba GROUP BY 1 ORDER BY 2 ASC;
Team | corr
-----------------------+--------
Cleveland Cavaliers | -0.3219
San Antonio Spurs | -0.2015
Oklahoma City Thunder | -0.1236
Detroit Pistons | -0.0678
New Orleans Pelicans | -0.0459
Los Angeles Clippers | -0.0279
Utah Jazz | 0.0913
Washington Wizards | 0.1217
Dallas Mavericks | 0.1388
Sacramento Kings | 0.1489
Milwaukee Bucks | 0.1626
Golden State Warriors | 0.1648
Minnesota Timberwolves | 0.1909
Denver Nuggets | 0.2035
Houston Rockets | 0.2051
Philadelphia 76ers | 0.2645
Chicago Bulls | 0.2663
Phoenix Suns | 0.2808
Orlando Magic | 0.2878
Toronto Raptors | 0.2916
Memphis Grizzlies | 0.3225
Miami Heat | 0.3635
Charlotte Hornets | 0.3779
Brooklyn Nets | 0.4084
Indiana Pacers | 0.4261
Atlanta Hawks | 0.4321
New York Knicks | 0.4401
Los Angeles Lakers | 0.4563
Portland Trail Blazers | 0.4856
Boston Celtics | 0.6904