In Part 1 I give an overview of SPC. Statistical Process Control (SPC) is a way of accurately predicting what an entire data group will look like based on small samples. This is important as everything varies over time and, if the data group happens to be web statistics, it may be vital to know whether a rise or fall in, for instance the number of vistors your web site or intranet has had in a week, may just be a part of the normal variation or is due to some significant change.
In this post I’ll show you how you can define the ‘normal’ variation for any web statistic. I’ll also give examples and show you how easy SPC is to use and how powerful a tool it can be in aiding analysis of your web data.