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v4.2
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v4.2

    stddev()

    Function stddev() calculates the standard deviation of a column of numbers. Only one row from the data stream will be kept after this function is called, and all the rest rows will be abandoned.

    Arguments:

    • Number <number>, auto-abstraction: UUID of NODE/EDGE, row index (starting from 0) of PATH/TABLE, or the first element of ARRAY

    Returns:

    • Stddev value <number>

    ATTR (Numeric value)

    Example: find the outbound 1-step paths from Card CA001, and calculate the standard deviation value of the amount of money transferred

    n({_id == "CA001"}).re({@transfer} as pay).n({@card})
    return stddev(pay.amount)
    
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