In this tutorial, you will find a detailed description of all the trendline options available in Excel and when to use them.

You will also learn how to display a trendline equation in a chart and find the slope of a trendline.

Topics:

• Excel trendline types.
• Excel trendline equations and formulas.
• Excel trendline equation is wrong - reasons and fixes.

In more advanced Excel formulas, you might run into the double negative operation (--).

The double negative (sometimes called the even more nerdy "double unary") coerces TRUE or FALSE values to their numeric equivalents, 1 and 0. It's used in formulas where numbers are needed for a particular math operation.

A double negative is not the only way to get ones and zeros from logicals. You can also add or subtract zero, multiply by one, or use the inscrutably named N function.

Financial models are often built ad hoc or without due planning, care and attention, and stories of faulty financial models are common.

ICAEW has created this financial modelling code to provide essential guidance to standard-setters, procurers and modellers on good practice. The guidance is principles-based, high-level and broadly accepted.

The code is divided into the following sections:

• Model definition and purpose.
• Layout and structure.
• User interface and transparency.
• Consistency.
• Clarity.
• Error reduction.
• Calculation techniques.

Excel Tables expand automatically whenever new data is added to the bottom. Data Validation lists would benefit from the auto-expand feature… but it just doesn't work.

This article shows you how to make a Data Validation list that refers to a Table, via three methods:

• Normal cell references over a Table.
• Named Range of the Table column.
• INDIRECT function.

Comprehensive list of things that you can do with Power Query.

Excel Power Query is one of the most powerful new features within Microsoft Excel and the easiest to learn.

You can use Power Query to clean & transform your data that you download from your ERP or accounting system and display it in a report for Excel to work with.

The best thing is that you can reapply the same transformation steps in just ONE single click, saving you HOURS! So next week when you get the same report with updated data, a simple REFRESH will transform your data once again!

As of October 2018, this interactive tutorial continues to be expanded, with 33 of the 50 topics completed. New topics are being added.

New features coming to Excel soon.

Until now, you wrote a formula for each value you wanted returned to the grid. One formula, one value. If you wanted another value, you wrote (or copied) another formula.

With dynamic arrays, that all changes.

Now, you can write a formula, hit the enter key, and get an array of values returned. One formula, many values. This will allow you to build more capable spreadsheets, faster, with fewer formulas and less chance of error.

Here is the full set of functions that will be accompanying dynamic arrays:

• FILTER Filters an array of data based on criteria you define.
• UNIQUE Returns a list of unique values from a list or range.
• SORT Sorts an array of values.
• SORTBY Sorts an array based on a corresponding array.
• SEQUENCE Generates a list of sequential numbers, such as 1, 2, 3, 4.
• SINGLE Accepts a range or array and returns a single value using implicit intersection. (Superseded)
• RANDARRAY Returns an array of random numbers between 0 and 1.

For more information, also see Mr. Excel: Major calc engine change.

So you're on a mission to remove external links from your Excel workbook, huh?

Seems like it should be easy, but as you are probably finding out, it sometimes isn't as easy as clicking the "break links" button (unfortunately).

This post walks you through all the hiding places that external links may be lurking, including:

• Cells.
• Charts.
• Shapes.
• Names ranges.
• Pivot Tables.
• Data Validation.

Excel 365 is getting a new cell comments system.

This video from Bill Jenen (AKA Mr. Excel) introduces the new system, highlighting the new features and providing advice about how and when to keep the old system.

Contents:

• Threaded comments are cool!
• Old and new comments can co-exist.
• Why to keep legacy comments.
• Converting to threaded comments is permanent.
• How to use legacy comments.
• New comment VBA.