Var_Samp





This function calculates the sample variance of a set of numbers after discarding NULL values from this set. It uses the following formula: (Sum(X^2) - Sum(X)^2/Quantity(X))/(Quantity(X) - 1).

If Quantity(X) = 1, the return value is NULL.

Syntax:

Var_Samp(Expression)

Parameter:

Expression. Type: Number

Example:

X

Y

1

7

2

1

3

2

4

5

5

7

6

34

7

32

8

43

9

87

SELECT Var_Samp(Y, X) FROM Table

Result:

805.694444


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