Here are the answers to your questions:
When I run a report, and select a date range, Clicktale tells me that different page versions will "skew" the data. What does that mean? The data may be skewed if the date range you choose includes significantly different page versions. This means that if you have page versions with much different content/layout aggregated together into one report, the page you see rendered in the Heatmap might not fully represent every page version you’ve chosen to aggregate since there may be big differences in the versions.
When I select over a week's worth of sessions to evaluate using heatmaps/link analytics, I'm only seeing "500 pageviews" for a given detail page We limit the amount of pageviews aggregated to 500. We've found that this is a large enough sample to understand how your content is being viewed, especially considering that you can see the results of another 500 pageviews every day/new version.
What are the best techniques and strategies for using Clicktale in an e-commerce environment, where the detail page is pretty much the same but the products are always different? If the detail page is the same regardless of the product, you should probably think about the different customer segments you have (men, women, age, bargain shoppers, etc). You can start looking at or tagging product pages (or unique landing pages) geared towards different segments to see how they interact with the navigation, checkout, view content, etc. You might find the layout doesn’t work so well for certain customer segments/products. I would also pay very close attention to category pages, scanning of content, sales cycles (using the first visit date), and interaction with sidebar content (Link Analytics is very useful for this).
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