Fun With Numbers: Amazon Rank Progression for US Releases (March 4)

In the interest of not posting all the tank data in a horrible confuse-a-gram like the one for the February data, I’ll be posting the 1 week before-and-after amazon rank results for the March data after I’m done collecting it. Additionally, I’ll be posting updates on an interesting finding I’ve had with the data for a particular series that will likely help me nail down theĀ  worth of the lower (100,000th or worse in movies and TV) ranking numbers.

How will I do that? Aria the Natural’s part 2 release was low-stocked and has not been purchased frequently. That means that, each day, the amazon page displays the total number of disks in stock at that time. This means I can use the daily decline (or lack thereof) in daily stock to determine how much its approximate ranking is worth in terms of daily sales. Emphasis on “lack thereof”:

Aria-InstockChart is date, rank, # in stock

This is a strong indication that places worse than 120,000th correspond to 1 or fewer purchases per day, which is an extremely useful bit of information. Whatever the eventual shape of any amazon-rank-to-sales fit ends up being, it should probably approach zero for rank values of that size. Also, it makes a handy cutoff point for measuring sales longevity; # of days above 120,000th place can be used to compare with series release-period sales peak as an important alternative measure of success. Selling 3 copies over 100 days is better than selling 10 copies in 1 day and 0-1 in every other.

Graphs of each of the eleven March 4th releases tracked over the past 2 weeks are shown after the break. I’ll save commentary for the end of the month, when I have at least the complete sample to work with, and at best a reasonable fit for the ballpark each series’ ranking is in in terms of total sales.

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Fun With Numbers: March 2014 Amazon Data (Initial Numbers)

Way back in December, I started a rough, bare-bones look at a bit of publicly available data; US Amazon TV/Movie bestseller list rankings for anime releases. That data collection is mostly done, pending K’s release this Tuesday, and it yielded some potentially interesting nuggets (expect that summary post to happen before this next weekend). Enough so that I plan to do the same at least for the month of March. This is a list of the releases I’ll be tracking over the next 30 days, with their release dates, prices, and initial rankings. All series were accessed via amazon’s upcoming anime releases page.

Two points before the list itself:

-I compiled my February list too early (several titles were only announced for release after I built my list), and missed the opportunity to track some releases that way. Since most titles tracked in the February sample were relatively steady and very low on the list until a week before release (save for Robotics;Notes’ ridiculously discounted edition), I’m going to start tracking monthly rankings approximately one week prior to the first set of releases from now on.

-The price I note is the series’ MSRP price. If the series becomes listed at more than 50% off that price at any time during the amazon solicitation, I will note that both now and during the final analysis. The February part 1 release of Robotics;Notes had such a discount.

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