This article describes the formula syntax and usage of the SUMX2MY2 function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.
Description
Returns the sum of the difference of squares of corresponding values in two arrays.
Syntax
SUMX2MY2(array_x, array_y)
The SUMX2MY2 function syntax has the following arguments (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):
 Array_x Required. The first array or range of values.
 Array_y Required. The second array or range of values.
Remarks
 The arguments should be either numbers or names, arrays, or references that contain numbers.
 If an array or reference argument contains text, logical values, or empty cells, those values are ignored; however, cells with the value zero are included.
 If array_x and array_y have a different number of values, SUMX2MY2 returns the #N/A error value.
 The equation for the sum of the difference of squares is:
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
First array 
Second array 
2 
6 
3 
5 
9 
11 
1 
7 
8 
5 
7 
4 
5 
4 
Formula 
Description (Result) 
=SUMX2MY2(A2:A8,B2:B8) 
Sum of the difference of squares of the two arrays above (55) 
=SUMX2MY2({2, 3, 9, 1, 8, 7, 5}, {6, 5, 11, 7, 5, 4, 4}) 
Sum of the difference of squares of the two arrays constants (55) 
