Sometimes it is not easy to get useful information from a stacked bar chart, see for instance

this blogpost at Support Analytics.

So-called inkblot charts, as discussed at Kaiser Fung’s

Junk Charts, allow the reader to focus on the evolution

of a time series.

Now how to make this kind of charts with R? I asked on

StackOverflow. The given answers led to an implementation

of an inkblot function. It is delivered with the `wzd` package on r-forge. Here is an example which visualizes the income per capita from

various countries, as reported by gapminder:

> #install.packages("wzd")

> library(wzd)

> data(gmIncomePerCapita)

> selection <- window(gmIncomePerCapita,

+ start=as.Date("1900-01-01"),

+ end=as.Date("2008-01-01")

+ )[,c("Germany", "India", "Japan", "Norway", "United States", "Venezuela")]

> inkblot(selection, min.height=1300)

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