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craig w

Another missing (and maybe misleading) element is the number of artists represented each year. It seems quite possible that the number of artists in 2013 is much larger than 2000.

So while it's true the 1% dominance is growing/maintaining, the dominance of the top 50 artists may be shrinking if the overall pool of artists is increasing.

In other words, 1% of the artists may not accurately represent "superstars". In fact the article mentions 25M digital tracks with 1% representing 250,000 tracks. Clearly those are not all written by what anyone would consider superstars.

Perhaps a better measure would have been a fixed number of artists?

daniel l

I use something like this on a regular basis: scenario is a percentage based kpi where I have winners and losers. I use a line/stacked bar combo with my winners in a muted series, losers as a highlighted series, and the KPI itself as the line.

I always felt like it passes the trifecta in that: the chart answers any practical question one might have with a high degree of self sufficiency. Any question you'd have about the number 95%: how many actual losers, how many total is answered, and what's the percentage is being answered.


But now hearing Kaiser take this apart, my friday is ruined!!!! :)

Andrew Gelman

Kaiser:

I'd like to recommend another option: display 2 graphs, one showing the trend of the total, the other showing the trend in the proportions. No need to cram all the information into one graph.

Kaiser

Andrew: Good point. If both messages are important, we should use two charts. For business metrics, I have always found it necessary to produce two almost identical sets of charts, the only difference being absolute and relative metrics so one version shows the trend in number of sales and the other one shows the trend in sales rate.

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