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Release 9.2


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This example shows some of the statistical functions that use the sample method of computation.

Functions:

ItemDescription
STDEVSAMP Function Computes the standard deviation across column values of Integer or Decimal type using the sample statistical method.
VARSAMP Function Computes the variance among all values in a column using the sample statistical method. Input column can be of Integer or Decimal. If no numeric values are detected in the input column, the function returns 0
STDEVSAMPIF Function Generates the standard deviation of values by group in a column that meet a specific condition using the sample statistical method.
VARSAMPIF Function Generates the variance of values by group in a column that meet a specific condition using the sample statistical method.
ROUND Function Rounds input value to the nearest integer. Input can be an Integer, a Decimal, a column reference, or an expression. Optional second argument can be used to specify the number of digits to which to round.

Source:

Students took tests on three consecutive Saturdays:


StudentDateScore
Andrew11/9/1981
Bella11/9/1984
Christina11/9/1979
David11/9/1964
Ellen11/9/1961
Fred11/9/1963
Andrew11/16/1973
Bella11/16/1988
Christina11/16/1978
David11/16/1967
Ellen11/16/1987
Fred11/16/1990
Andrew11/23/1976
Bella11/23/1993
Christina11/23/1981
David11/23/1997
Ellen11/23/1997
Fred11/23/1991

Transformation:

You can use the following transformations to calculate standard deviation and variance across all dates using the sample method. Each computation has been rounded to three digits.

Transformation Name New formula
Parameter: Formula type Single row formula
Parameter: Formula round(stdevsamp(Score), 3)
Parameter: New column name 'stdevSamp'

Transformation Name New formula
Parameter: Formula type Single row formula
Parameter: Formula round(varsamp(Score), 3)
Parameter: New column name 'varSamp'

You can use the following to limit the previous statistical computations to the last two Saturdays of testing: 

Transformation Name New formula
Parameter: Formula type Single row formula
Parameter: Formula round(stdevsampif(Score, Date != '11\/9\/2019'), 3)
Parameter: New column name 'stdevSampIf'

Transformation Name New formula
Parameter: Formula type Single row formula
Parameter: Formula round(varsampif(Score, Date != '11\/9\/2019'), 3)
Parameter: New column name 'varSampIf'

Results:


StudentDateScorevarSampIfstdevSampIfvarSampstdevSamp
Andrew11/9/198194.5159.722131.67311.475
Bella11/9/198494.5159.722131.67311.475
Christina11/9/197994.5159.722131.67311.475
David11/9/196494.5159.722131.67311.475
Ellen11/9/196194.5159.722131.67311.475
Fred11/9/196394.5159.722131.67311.475
Andrew11/16/197394.5159.722131.67311.475
Bella11/16/198894.5159.722131.67311.475
Christina11/16/197894.5159.722131.67311.475
David11/16/196794.5159.722131.67311.475
Ellen11/16/198794.5159.722131.67311.475
Fred11/16/199094.5159.722131.67311.475
Andrew11/23/197694.5159.722131.67311.475
Bella11/23/199394.5159.722131.67311.475
Christina11/23/198194.5159.722131.67311.475
David11/23/199794.5159.722131.67311.475
Ellen11/23/199794.5159.722131.67311.475
Fred11/23/199194.5159.722131.67311.475

See Also for EXAMPLE - Statistical Functions Sample Method:

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