# Excel University Blog

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# Functions

## Formula Override Conditional Formatting Alert

| April 23, 2015 |

Let me ask you a question. How do you know when a user has entered a value into a formula cell, essentially overriding your formula? Since this is Excel, there are several ways to address this issue, but starting with Excel 2013, we can use conditional formatting with the new ISFORMULA function. Objective Our worksheet…

## Moving, Rolling, and Trailing Averages

| March 19, 2015 |

The terms Moving, Rolling, and Trailing are commonly used to describe the same calculation idea…that we want to operate on the previous say 3, 6, or 12 data rows. In this post, we’ll allow the user to define the number of rows to include and use the OFFSET function to dynamically define the desired range. Objective…

## Sum Last N Columns

| March 12, 2015 |

If you have a data table that is updated frequently, for example, a new column is added each month, you may want to find the sum of the last three columns. But, you don’t want to rewrite your formula each time you add a new column. Fortunately, you can accomplish this task with two lookup functions,…

## Slicers as an Alternative to Conditional Drop Downs

| February 9, 2015 |

Beginning with Excel 2013 for Windows, we can use Slicers to filter table data. In this post, we’ll explore how to use Slicers as a relatively easy alternative to conditional drop-downs. Objective When we want to allow a user to select a choice from a list of items, we often consider using the Data Validation feature to…

## Income Tax Formula

| December 31, 2014 |

In this post, we’ll examine a couple of ideas for computing income tax in Excel using tax tables. Specifically, we’ll use VLOOKUP with a helper column, we’ll remove the helper column with SUMPRODUCT, and then we’ll use data validation and the INDIRECT function to make it easy to pick the desired tax table, such as single or married…

## Indirectly Refer to Table Columns

| November 20, 2014 |

Previously, we explored using the INDIRECT function to refer to various tables in a workbook. In this follow-up post, we’ll expand the discussion and refer to individual table columns. Objective Let’s start with our objective. We have several tables in a workbook. They have the same structure and store department data. For example, here is…

## Referring to Tables Indirectly

| November 13, 2014 |

In this post, we’ll allow the user to select a table name from a data validation drop-down and our Excel formulas will operate on the values from the selected table. Thanks to Neelima for asking about this technique! Objective Before we get too far, let’s be clear about our objective. We have several data tables in…

## Bullet Graphs in Excel

| October 27, 2014 |

I recently picked up a copy of Stephen Few’s outstanding book Information Dashboard Design. First of all…wow! If your reports include any type of chart or graph, you owe it to yourself to pick up a copy of this incredible resource. Stephen developed a graph called a Bullet Graph, and in this post, I’ll walk through…

## Simulate Structured References in Named Ranges

| October 23, 2014 |

The table feature introduced in Excel 2007 is amazing and has nearly eliminated the need to build dynamic named ranges since tables auto-expand. Beyond auto-expansion, tables offer numerous other benefits, including, structured references which allow us to refer to an area within the table, such as a specific column. In this post, we’ll examine a method…