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The SUM function in Excel allows you to add up the values in a range of cells. However, sometimes you only want to add up the cells that meet certain criteria. That's where the SUMIF function comes in handy, along with the more capable SUMIFS function.

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The SUMPRODUCT function allows you to multiply two arrays of numbers together (e.g. Quantity Sold and Price Per Unit) and add the results each individual calculation together. Without the SUMPRODUCT function, you'll find yourself having to create a third column in which you multiply the Quantity by Price for each row, and then find the sum of all the individual formulas. This lesson shows you how to use SUMPRODUCT to do all that with just one formula.

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If you're using Excel to calculate dates, it is useful to know how to add (or subtract) a certain number of working or business days to a date. This lesson introduces the WORKDAY() function and shows you how to use it.

If you have a range of cells, of which some contain values and some are blank, and you want to select just the blank cells, there is a quick way to select those blank cells that doesn't involve manually clicking on every one.

Google Analytics allows you to email reports from your account. This enables you to share reports with people who don't have access to your Google Analytics account, including people who are only interested in specific reports from Google Analytics. You can control which format the reports are sent in, and the frequency with which they are emailed. This lesson shows you how to set up email reports from Google Analytics, as well as pointing out a couple of things you should be aware of when setting them up.

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Sometimes you'll find yourself working with dates in an Excel spreadsheet that have been pasted or imported into Excel from another datasource. When that happens, Excel can treat those dates as text - in other words, they look like dates but don't behave like dates. For example you can't sort by date properly. This lesson looks at several ways you can convert a date which Excel is treating as text into a proper date value in Excel.

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The Pivot Table Report Filter adds another dimension to your pivot tables - literally. Rather than all of your data being presented in a flat table, the Report Filter lets you create a pivot table report and then change the data being presented using one or more Report Filters.

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When writing a formula that references other cells, it can sometimes be useful to check that those cells contain a valid value. In this lesson, we'll look at Excel's ISNUMBER function as a way of doing this.

This lesson covers various aspects of managing users at the command line in Linux.

When you are working with a large spreadsheet in Microsoft Excel, it's easy to find yourself scrolling down or across and losing track of where you are. This lesson explains how to freeze rows and columns (officially known as "Freeze Panes") in Excel 2010 for Windows and Excel 2011 for Mac.

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