Posts Tagged ‘ graphics ’

A web-based graphics application based on R

December 24, 2009
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A web-based graphics application based on R

FlowingData recently took a look at Jeroen Ooms' latest web-based statistical tool based on R. We've looked at his tools for random-effects models and finance visualizations before, but this one is a more general tool for creating graphs from data sets using the ggplot2 package. It's pretty slick. All you need to do is upload a data set (in...

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Because it’s Friday: The decline of empires

December 18, 2009
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Here's a neat visualization of the decline of the British, Spanish, Portugese and French empires from 1800 to present day. It's definitely more art than stats -- judging by the relative size of India and Australia I think the circles are scaled to area, not population -- but it definitely does capture the drama and the ebb and flow...

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The R Graphical Manual

December 10, 2009
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R has a lot of functions. Add in all the packages on CRAN, and then there's a lot of functions. You can search through the contents of the function documentation at places like Rseek.org, but the R Graphical Manual takes a different tack on exploring the functions in R: rather than browsing by the name or description of the...

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R Tutorial Series: Scatterplots

November 12, 2009
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R Tutorial Series: Scatterplots

A scatterplot is a useful way to visualize the relationship between two variables. Similar to correlations, scatterplots are often used to make initial diagnoses before any statistical analyses are conducted. This tutorial will explore the ways in whic...

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Example 7.15: A more complex sales graphic

October 13, 2009
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Example 7.15: A more complex sales graphic

The plot of Amazon sales rank over time generated in example 7.14 leaves questions. From a software perspective, we'd like to make the plot prettier, while we can embellish the plot to inform our interpretation about how the rank is calculated.For the latter purpose, we'll create an indicator of whether the rank was recorded in nighttime (eastern US...

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50000 Revisions Committed to R

October 10, 2009
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50000 Revisions Committed to R

oday Romain Francois posted an interesting topic in the R-help list, and you can read his blog post for more details: celebrating R commit #50000. 50000 is certainly not a small number; we do owe R core members a big “thank you” for their great efforts in this fantastic statistical language in the 13 years.

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Example 7.12: Calculate and plot a running average

September 17, 2009
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Example 7.12: Calculate and plot a running average

The Law of Large Numbers concerns the stability of the mean, as sample sizes increase. This is an important topic in mathematical statistics. The convergence (or lack thereof, for certain distributions) can easily be visualized in SAS and R (see also Horton, Qian and Brown, 2004).Assume that X1, X2, ..., Xn are independent and identically distributed realizations...

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Example 7.8: Plot two empirical cumulative density functions using available tools

August 1, 2009
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Example 7.8: Plot two empirical cumulative density functions using available tools

The empirical cumulative density function (CDF) (section 5.1.16) is a useful way to compare distributions between populations. The Kolmogorov-Smirnov (section 2.4.2) statistic D is the value of x with the maximum distance between the two curves. As an...

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RGG#155, 156 and 157

July 21, 2009
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RGG#155, 156 and 157

I pushed 3 more graphics from Biecek Przemyslaw to the graphics gallery A list of popular names for colors from packages RColorBrewer, colorRamps, grDevices A set of examples of few graphical low-level parameters lend, ljoin, xpd, adj, lege...

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RGG# 154: demo of atomic functions

July 7, 2009
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RGG# 154: demo of atomic functions

Przemyslaw Biecek has submitted this graph (and also others I will add later) to the graphics gallery A list of examples for the atomic functions polygon(), segments(), symbols(), arrows(), curve(), abline(), points(), lines(). this figure is t...

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