Diagnostic daytime multiple sleep latency test (MSLT) is used to diagnose narcolepsy and to measure the degree of daytime sleepiness. It measures how quickly you fall asleep in quiet situations during the day. It also monitors how quickly and how often you enter REM sleep.
Array formulas provide a way by which Excel users can discover such useful information. To explain the power of array formulas I'll use this database. It shows sales by Seller, Product, Region, and Customer, with Quantity and Total Sales, in dollars. I named each column of data with the label shown in row 1.
Quick Answer. Microsoft Excel is a spreadsheet application designed to perform basic and complex mathematical computations and functions. In addition to performing arithmetic operations, Excel allows users to create graphical displays of data, forms and pivot tables. It is also routinely used to sort information and assist users in identifying data trends.