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TopSum (DMX)

Returns, in order of decreasing rank, the top-most rows of a table whose cumulative total is at least a specified value.


          

TopSum(<table expression>, <rank expression>, <sum>)
        

An expression that returns a table, such as a <table column reference>, or a function that returns a table.

<table expression>

The TopSum function returns the top-most rows in decreasing order of rank based on the evaluated value of the <rank expression> argument for each row, such that the sum of the <rank expression> values is at least the given total that is specified by the <sum> argument. TopSum returns the smallest number of elements possible while still meeting the specified sum value.

The following example creates a prediction query against the Association model that you build by using the Basic Data Mining Tutorial.

To understand how TopPercent works, it might be helpful to first execute a prediction query that returns only the nested table.

SELECT Predict ([Association].[v Assoc Seq Line Items], INCLUDE_STATISTICS, 10)
FROM 
     [Association]
NATURAL PREDICTION JOIN
SELECT (SELECT 'Women''s Mountain Shorts' as [Model]) AS [v Assoc Seq Line Items]) AS t
Note Note

In this example, the value supplied as input contains a single quotation mark, and therefore must be escaped by prefacing it with another single quotation mark. If you are not sure of the syntax for inserting an escape character, you can use the Prediction Query Builder to create the query. When you select the value from the dropdown list, the required escape character is inserted for you. For more information, see Create a Singleton Query in the Data Mining Designer.

Example results:

Model

$SUPPORT

$PROBABILITY

$ADJUSTEDPROBABILITY

Sport-100

4334

0.291283016

0.252695851

Water Bottle

2866

0.192620472

0.175205052

Patch kit

2113

0.142012232

0.132389356

Mountain Tire Tube

1992

0.133879965

0.125304948

Mountain-200

1755

0.117951475

0.111260823

Road Tire Tube

1588

0.106727603

0.101229538

Cycling Cap

1473

0.098998589

0.094256014

Fender Set - Mountain

1415

0.095100477

0.090718432

Mountain Bottle Cage

1367

0.091874454

0.087780332

Road Bottle Cage

1195

0.080314537

0.077173962

The TopSum function takes the results of this query and returns the rows with the greatest values that sum to the specified count.

SELECT 
TopSum
    (
    Predict([Association].[v Assoc Seq Line Items],INCLUDE_STATISTICS,10),
    $PROBABILITY,
    .5)
FROM 
     [Association]
NATURAL PREDICTION JOIN
(SELECT (SELECT 'Women''s Mountain Shorts' as [Model]) AS [v Assoc Seq Line Items]) AS t

The first argument to the TopSum function is the name of a table column. In this example, the nested table is returned by calling the Predict function and using the INCLUDE_STATISTICS argument.

The second argument to the TopSum function is the column in the nested table that you use to order the results. In this example, the INCLUDE_STATISTICS option returns the columns $SUPPORT, $PROBABILTY, and $ADJUSTED PROBABILITY. This example uses $PROBABILITY to return rows that sum to at least 50% probability.

The third argument to the TopSum function specifies the target sum, as a double. To get the rows for the top products that sum to 50 percent probability, you type .5.

Example results:

Model

$SUPPORT

$PROBABILITY

$ADJUSTEDPROBABILITY

Sport-100

4334

0.29…

0.25…

Water Bottle

2866

0.19…

0.17…

Patch kit

2113

0.14…

0.13…

Note    This example is provided only to illustrate the usage of . Depending on the size of your data set, this query might take a long time to run.

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