# EXAMPLE - KTHLARGEST Function

This example explores how you can use aggregation functions to calculate rank of values in a column.

Functions:

Item

Description

KTHLARGEST Function

Extracts the ranked value from the values in a column, where k=1 returns the maximum value. The value for k must be between 1 and 1000, inclusive. Inputs can be Integer, Decimal, or Datetime.

KTHLARGESTUNIQUE Function

Extracts the ranked unique value from the values in a column, where k=1 returns the maximum value. The value for k must be between 1 and 1000, inclusive. Inputs can be Integer, Decimal, or Datetime.

Source:

You have a set of student test scores:

Student

Score

Anna

84

Ben

71

Caleb

76

Danielle

87

Evan

85

Faith

92

Gabe

87

Hannah

99

Ian

73

Jane

68

Transformation:

You can use the following transformations to extract the 1st through 4th-ranked scores on the test:

 Transformation Name New formula Single row formula KTHLARGEST(Score, 1) '1st'
 Transformation Name New formula Single row formula KTHLARGEST(Score, 2) '2nd'
 Transformation Name New formula Single row formula KTHLARGEST(Score, 3) '3rd'
 Transformation Name New formula Single row formula KTHLARGEST(Score, 4) '4th'
 Transformation Name New formula Single row formula KTHLARGESTUNIQUE(Score, 3) '3rdUnique'
 Transformation Name New formula Single row formula KTHLARGESTUNIQUE(Score, 4) '4thUnique'

Results:

When you reorganize the columns, the dataset might look like the following:

Student

Score

1st

2nd

3rd

4th

3rdUnique

4thUnique

Anna

84

99

92

87

87

87

85

Ben

71

99

92

87

87

87

85

Caleb

76

99

92

87

87

87

85

Danielle

87

99

92

87

87

87

85

Evan

85

99

92

87

87

87

85

Faith

92

99

92

87

87

87

85

Gabe

87

99

92

87

87

87

85

Hannah

99

99

92

87

87

87

85

Ian

73

99

92

87

87

87

85

Jane

68

99

92

87

87

87

85

Notes:

• The value87is both the third and fourth scores.

• For the KTHLARGEST function, it is the output for the third and fourth ranking.

• For the KTHLARGESTUNIQUE function, it is the output for the third ranking only.