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Actually, it's simply the square root of the variance.
8> Create Table MyValues (MyValue Float)
9> GO
1>
2> Insert Into MyValues (MyValue) SELECT 2
3> Insert Into MyValues (MyValue) SELECT 3
4> Insert Into MyValues (MyValue) SELECT 4
5> Insert Into MyValues (MyValue) SELECT 5
6> Insert Into MyValues (MyValue) SELECT 6
7> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
1>
2> SELECT VAR(MyValue) FROM MyValues
3> GO
------------------------
2.5
(1 rows affected)
1>
2> SELECT STDEV(MyValue) FROM MyValues
3>
4> drop table MyValues;
5> GO
------------------------
1.5811388300841898
(1 rows affected)
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