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Comment: Published by Scroll Versions from space DEV and version r0411

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  • If an input value is missing or null, it is not factored in the computation. For example, for the first row in the dataset, the rolling average of previous values is the value in the first row.
  • The row from which to extract a value is determined by the order in which the rows are organized based on the order parameter.

     If you are working on a randomly generated sample of your dataset, the values that you see for this function might not correspond to the values that are generated on the full dataset during job execution.

     

  • The function takes a column name and two integer parameters that determine the window backward and forward of the current row.
    • The default integer parameter values are -1 and 0, which computes the rolling average from the current row back to the first row of the dataset.
  • This function works with the following transforms:

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Rows before example:

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window value:ROLLINGAVERAGE(myNumber, 3)

Output: Generates the new column, which contains the rolling average of the current row and the two previous row values in the myNumber column.     

Rows before and after example:

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

  • rowBefore=1 generates the current row value only.
  • rowBefore=-1  uses all rows preceding the current one.
  • If rowsAfter is not specified, then the value 0 is applied.
  • If a group parameter is applied, then these parameter values should be no more than the maximum number of rows in the groups.

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Required?Data TypeExample Value
YesInteger4

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