Quote:
Originally Posted by fjtorres
Amazon Ranking is not an exact number but rather a rolling average for several days. That is one of many reasons Data Guy reports ratios rather than absolute numbers. The other being that absolutes aren't useful to the goal of measuring change in the industry because of their longer term volatility, especially with BPH titles spikey launch windows.
Remember, DG works with hundreds of thousands of titles across different categories to categorize the market, not individual titles. As is, the rolling average reduces the report's volatility. If nothing else, because it takes time for the spiders to crawl.
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But even rolling averages need accurate numbers to start with and maintain over time. If DG could obtain several figures in the top 100, it would really firm up the data. Ideally, he would need data from several days even weeks to avoid the spikes. This time he chose a day where indies spiked.
Anyway, it's the best we have and I appreciate all the work DG put into it.