June 2009
Beginner
500 pages
9h 40m
English
Content preview from Statistical Analysis with Excel® For Dummies®, 2nd Edition
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Chapter 7. Summarizing It All
In This Chapter
Things great and small
Symmetry, peaks, and plateaus
Getting descriptive
Statistics served up on a tray
Measures of central tendency and variability are excellent ways of summarizing a set of scores. They aren't the only ways. Central tendency and variability make up a subset of descriptive statistics. Some descriptive statistics are intuitive — like count, maximum, and minimum. Some are not — like skewness and kurtosis.
In this chapter, I discuss descriptive statistics, and I show you Excel's capabilities for calculating them and visualizing them.
Counting Out
The most fundamental descriptive statistic I can imagine is the number of scores in a set of scores. Excel offers five ways to determine that number. Yes, five ways. Count them.
COUNT, COUNTA, COUNTBLANK, COUNTIF, COUNTIFS
Given an array of cells, COUNT gives you the amount of those cells that contain numerical data. Figure 7-1 shows that I've entered a group of scores, selected a cell to hold COUNT's result, and opened the Function Arguments dialog box for COUNT. Here are the steps:
Figure 7.1. The Function Arguments Dialog Box for COUNT, showing multiple arguments.
Enter your data into the worksheet and select a cell for the result.
I entered data into columns C, D, and E to show off COUNT's multi-argument capability. I selected cell C14 to hold the count.
From the Statistical Functions menu, ...
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