-
Book Overview & Buying
-
Table Of Contents
Data Analysis Using SQL and Excel - Second Edition
By :
Sampling, however, is much more useful than just comparing average values. Here are some examples of how various samples might be used.
A sample of orders might be used for visualizing data. A scatter plot with tens or hundreds of thousands of points simply is not feasible; it will look like a big blob of color. However, getting a random sample of data might convey important information.
Sometimes, we might want to repeat the random sample, so it can be re-created at will. This is often true when—due to permissions—we are unable to store the sample in a table of our own.
A random sample is just what its name suggests—random. So, a given statistic on the sample, such as the average order size varies around the average in the entire population. Sometimes, we want to be sure that the data is as representative as possible for certain columns. For instance, we might want the average order size to be as similar to the overall population as possible...
Change the font size
Change margin width
Change background colour