Computes the rolling standard deviation of values forward or backward of the current row within the specified column using the sample statistical method.

NOTE: This function applies to a sample of the entire population. More information is below.

For more information on a non-rolling version of this function, see STDEV Function.

Column example:

rollingstdevsamp(myCol)

Output: Returns the rolling standard deviation of all values in the myCol column using the sample method of calculation.

Rows before example:

rollingstdevsamp(myNumber, 100)

Output: Returns the rolling standard deviation of the current row and the 100 previous row values in the myNumber column using the sample method of calculation.

Rows before and after example:

rollingstdevsamp(myNumber, 3, 2)

Output: Returns the rolling standard deviation of the three previous row values, the current row value, and the two rows after the current one in the myNumber column.     

rollingstdevsamp(col_ref, rowsBefore_integer, rowsAfter_integer) order: order_col [group: group_col]


ArgumentRequired?Data TypeDescription
col_refYstringName of column whose values are applied to the function
rowsBefore_integerNintegerNumber of rows before the current one to include in the computation
rowsAfter_integerNintegerNumber of rows after the current one to include in the computation

For more information on the order and group parameters, see Window Transform.

col_ref

Name of the column whose values you wish to use in the calculation. Column must be a numeric (Integer or Decimal) type.

Required?Data TypeExample Value
YesString (column reference to Integer or Decimal values)myColumn

rowsBefore_integer, rowsAfter_integer

Integers representing the number of rows before or after the current one from which to compute the rolling function, including the current row. For example, if the first value is 5, the current row and the five before after it are used in the computation. Negative values for rowsAfter_integer compute the rolling function from rows preceding the current one.

Required?Data TypeExample Value
NoInteger4

Example - Rolling computations for racing splits