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EXAMPLE - Statistical Functions Sample Method

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

  • STDEVSAMP - computes standard deviation using the sample method. See STDEVSAMP Function.

  • VARSAMP - computes variance using the sample method. See VARSAMP Function.

  • STDEVSAMPIF - computes standard deviation based on a condition and using the sample method. See STDEVSAMPIF Function.

  • VARSAMPIF - computes standard deviation based on a condition and using the sample method. See VARSAMPIF Function.

Source:

Students took tests on three consecutive Saturdays:

Student

Date

Score

Andrew

11/9/19

81

Bella

11/9/19

84

Christina

11/9/19

79

David

11/9/19

64

Ellen

11/9/19

61

Fred

11/9/19

63

Andrew

11/16/19

73

Bella

11/16/19

88

Christina

11/16/19

78

David

11/16/19

67

Ellen

11/16/19

87

Fred

11/16/19

90

Andrew

11/23/19

76

Bella

11/23/19

93

Christina

11/23/19

81

David

11/23/19

97

Ellen

11/23/19

97

Fred

11/23/19

91

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:

Student

Date

Score

varSampIf

stdevSampIf

varSamp

stdevSamp

Andrew

11/9/19

81

94.515

9.722

131.673

11.475

Bella

11/9/19

84

94.515

9.722

131.673

11.475

Christina

11/9/19

79

94.515

9.722

131.673

11.475

David

11/9/19

64

94.515

9.722

131.673

11.475

Ellen

11/9/19

61

94.515

9.722

131.673

11.475

Fred

11/9/19

63

94.515

9.722

131.673

11.475

Andrew

11/16/19

73

94.515

9.722

131.673

11.475

Bella

11/16/19

88

94.515

9.722

131.673

11.475

Christina

11/16/19

78

94.515

9.722

131.673

11.475

David

11/16/19

67

94.515

9.722

131.673

11.475

Ellen

11/16/19

87

94.515

9.722

131.673

11.475

Fred

11/16/19

90

94.515

9.722

131.673

11.475

Andrew

11/23/19

76

94.515

9.722

131.673

11.475

Bella

11/23/19

93

94.515

9.722

131.673

11.475

Christina

11/23/19

81

94.515

9.722

131.673

11.475

David

11/23/19

97

94.515

9.722

131.673

11.475

Ellen

11/23/19

97

94.515

9.722

131.673

11.475

Fred

11/23/19

91

94.515

9.722

131.673

11.475

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