novels

Quantitative Analysis of Top 60 Kindle Romance Novels

I did a quantitative analysis of the current Top 60 Kindle Romance ebooks. Here are the results. First I’ll take a look at all price related data and conclusions.

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  • Price over rank:

pricerank

There seems to be no relation between price and rank. A linear fit confirmed this. The average price was 3.70 $ with a standard deviation of 2.70 $.

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  • Price frequency count:

pricescount

(Note that prices have been rounded up) About one third of all romance novels in the top 60 are offered for 1 $. Roughly another third for 3 $ or 4 $.

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  • Price per 100 pages over rank:

pricerank

Again, no relation here. The average price per 100 pages was 1.24 $ with a standard deviation of 0.86 $.

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  • Price per 100 pages frequency count:

PPP1

About half of all novels in the top 60 have a price per 100 pages lower than 1.20 $. Another third lies between 1.20 $ and 1.60 $.

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  • Price per 100 pages over number of pages:

PPP2

As I expected, the bigger the novel, the less you pay per page. Romance novels of about 200 pages cost 1.50 $ per 100 pages, while at 400 pages the price drops to about 1 $ per 100 pages. The decline is statistically significant, however there’s a lot of variation.

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  • Review count:

reviewscount

A little less than one half of the top novels have less than 50 reviews. About 40 % have between 50 and 150 reviews. Note that some of the remaining 10 % more than 600 reviews (not included in the graph).

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  • Rating over rank:

rankreviews

There’s practically no dependence of rank on rating among the top 60 novels. However, all have a rating of 3.5 stars or higher, most of them (95 %) 4 stars or higher.

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  • Pages over ranking:

pagesrank

There’s no relation between number of pages and rank. A linear fit confirmed this. The average number of pages was 316 with a standard deviation of 107.

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  • Pages count:

pagescount

About 70 % of the analyzed novels have between 200 and 400 pages. 12 % are below and 18 % above this range.

Typical Per-Page-Prices for Ebooks

I did a little analysis of ebook prices per 100 pages for different categories in the Amazon Kindle store. In each category I looked at the top 12 paid books. This data can help readers to judge prices and authors to set them. Here are the results in increasing order:

Erotica: 1.7 $ per 100 pages (ranging from 1.0 – 3.1 $ per 100 pages)
Sci-Fi and Fantasy: 1.8 $ per 100 pages (ranging from 0.8 – 4.4 $ per 100 pages)
Short Stories: 2.0 $ per 100 pages (ranging from 0.5 – 4.2 $ per 100 pages)
Self-Help: 3.6 $ per 100 pages (ranging from 1.3 – 6.7 $ per 100 pages)
Applied Math: 4.0 $ per 100 pages (ranging from 0.9 – 7.9 $ per 100 pages)
Economy / Business: 7.2 $ per 100 pages (ranging from 3.3 – 17.2 $ per 100 pages)

Typical (and in my opinion fair) prices seem to be 2 $ per 100 pages for fiction and 4 $ per 100 pages for non-fiction. In the special case of business books, prices of 7 $ per 100 pages seem common.