Statistical Test for Google Analytics

One very useful feature of Google Analytics is the comparison of timeframes for metrics. You can compare number of sessions, bounce rate, E-commerce transactions, AdWords cost, etc. between adjacent weeks, months, or years.

One shortcoming in this comparison feature is that the percentage change calculated by Google for these metrics is not qualified. This extension addresses this shortcoming by evaluating the change between time periods for statistical significance.

Currently, for 5 < points < 40 the Wilcoxon Signed-Rank test is used. For points > 40, the paired Student's t-test is used.

Release Notes:

Version 3.1

• Separate tab for each metric; support multiple metrics on graph
• Should support metrics from line graphs on any page
• Reload button for when extension misses capturing data
• Also show date range and percentage change for metric

Version 2.3