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='Order Details'[Sales Amount] - AVERAGE('Order Details'[Sales Amount])
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The example calculates the deviation from the mean for the sales on each order line Blank or TRUE/FALSE values are ignored Zeros count toward the total number of rows You can t calculate AVERAGE() on a column that contains text The AVERAGE() function only accepts a column the following expression is invalid as an input:
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=AVERAGE('Order Details'[Quantity] * 'Order Details'[UnitPrice])
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AVERAGEX()
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This is an X-function It takes a table as its first parameter if you try a column instead, you ll receive an error The second parameter is the column, or expression with scalar result, that you wish to average This example is a calculated column in the Employees table
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=AVERAGEX(RELATEDTABLE(Orders),Orders[Freight])
Result
Analysis
Here, RELATEDTABLE() is used to generate a table, which is then passed into AVERAGEX() as the first argument The second argument causes AVERAGEX() to calculate the mean freight charge of all orders gained by each employee Michael Suyama has the lowest freight charges
Prac tical PowerPivot & DAX Formulas for Excel 2010
AVERAGEA()
Here we see the first of the A-functions Unlike the X-functions, the A-functions require a column as their first parameter Also, unlike the X-functions, the A-functions take only a single parameter In those respects, AVERAGEA() is similar to the base function, AVERAGE() However, there is a major difference between the base functions and the A-functions the A-functions can cope with non-numeric and non-date data These examples are calculated columns in the Products table
Syntax
=AVERAGE(Products[Discontinued]) =AVERAGEA(Products[Discontinued])
Result
Analysis
The Discontinued column has a data type of TRUE/FALSE The first example, AVERAGE(), generates an error AVERAGEA() does not give an error A TRUE counts as 1 and a FALSE as 0 A text value would also count as 0 If you multiply the result here by 77 (the total number of rows), the answer is 8 This indicates that 8 products are discontinued The COUNTROWS() function would give you the total number of rows in a table You could achieve the same answer (8) with the following formulas:
=COUNTROWS(FILTER(Products,[Discontinued]=TRUE)) =COUNTAX(FILTER(Products,[Discontinued]=TRUE),[Discontinued])COUNTAX() and COUNTROWS() are examined in this chapter, and FILTER() was discussed in the last chapter
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COUNT()
COUNT() is a base aggregate function Just as with AVERAGE(), there are A-function and X-function variations In addition, there is also an AX-function version as well This example is a calculated column in the Order Details table
Syntax
=COUNT('Order Details'[Discount])
Result
Analysis
The result is 2155 This does not necessarily mean there are 2155 rows in the table Rather, it indicates that 2155 rows contain a number (or date) in the specified column To return the number of rows in the table, COUNTROWS() is better, as COUNT() does not count non-numeric or non-date values In this case, every row in the Discount column contains a number, so it does represent the total count of the rows in the table
COUNTX()
This is the X-function version of the base COUNT() function This example is a calculated column in the Employees table
Syntax
=COUNTX(RELATEDTABLE(Orders),Orders[EmployeeID])
Prac tical PowerPivot & DAX Formulas for Excel 2010
Result
Analysis
The answer shows how many orders were attributable to each employee It works as the EmployeeID column is numeric COUNTX() also works on dates If you want to count non-numeric or non-date values in a table, try COUNTAX() If you wish to count the same in a column, use COUNTA() These two functions are covered next
COUNTA()
This time, it s the A-function version of COUNT() These examples are calculated columns in the Products table
Syntax
=COUNT(Products[Discontinued]) =COUNTA(Products[Discontinued])
Result
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Analysis
The Discontinued column has a data type of TRUE/FALSE Consequently, the first example results in an error as it uses COUNT() But COUNTA() is rather more successful
COUNTAX()
COUNTAX() is the AX-function variety of COUNT() The A means count non-numeric and non-date values, and the X means count a table-column rather than just a column These examples are calculated columns in the Products table
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