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
NULL
values, 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
):
Avery Bradley |
Boston Celtics |
0 |
PG |
25 |
2-Jun |
180 |
Texas |
7730337 |
---|---|---|---|---|---|---|---|---|
Jae Crowder |
Boston Celtics |
99 |
SF |
25 |
6-Jun |
235 |
Marquette |
6796117 |
John Holland |
Boston Celtics |
30 |
SG |
27 |
5-Jun |
205 |
Boston University |
|
R.J. Hunter |
Boston Celtics |
28 |
SG |
22 |
5-Jun |
185 |
Georgia State |
1148640 |
Jonas Jerebko |
Boston Celtics |
8 |
PF |
29 |
10-Jun |
231 |
5000000 |
|
Amir Johnson |
Boston Celtics |
90 |
PF |
29 |
9-Jun |
240 |
12000000 |
|
Jordan Mickey |
Boston Celtics |
55 |
PF |
21 |
8-Jun |
235 |
LSU |
1170960 |
Kelly Olynyk |
Boston Celtics |
41 |
C |
25 |
Jul-00 |
238 |
Gonzaga |
2165160 |
Terry Rozier |
Boston Celtics |
12 |
PG |
22 |
2-Jun |
190 |
Louisville |
1824360 |
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