standard deviation function

The standard deviation is a statistical function which measures the dispersion of a dataset relative to its mean, and it is the square root of the variance.

The higher the standard deviation, the furthest the values are far from the expected standard value.

Function and parameters

std(column, group)

Parameter

Description

column

It identifies the column to which you want to apply the formula. The column parameter is mandatory.

group

It allows you to group the results by a certain column.

Example

The following example uses the Bike sales dataset.

Description

Screenshot

  • In the example here, we want to retrieve the standard deviation of the Profit attribute.

  • We add a new attribute and we write the following formula: std($"Profit")

  • If we want to be more precise with our analysis, we can add the group parameter.

  • Here we want to group the results by the Country values, so the formula will be: std($"Profit",$"Country")

  • The results are as follows:

    • The standard deviation for the Profit in Canada is 451.913.

    • The standard deviation for the Profit in Australia is 430.600.

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