Hanging rootograms and viz. differences in time series

These two quick charting tips are based on the notion that comparing differences from a straight line are easier than comparing deviations from a curved line. The problems with comparing differences between curved lines are similar to the difference between comparings length and distance from a common baseline (so Cleveland's work is applicable), but the...  Continue reading Hanging rootograms and viz. differences in time series

Getting the Most of the Extension Commands on the SPSS Community Site

The SPSS Community website has a wealth of resources for users of SPSS Statistics and other SPSS products. In particular, there are many extension commands you can download and use for free. Extension commands typically consist of a dialog box interface, traditional SPSS syntax, and an implementation in Python or R.   Continue reading Getting the Most of the Extension Commands on the SPSS Community Site

Using circular dot plots instead of circular histograms

Although as I mentioned in this post on circular helio bar charts, polar coordinates are unlikely to be as effective as rectilinear coordinates for most types of comparisons, I really wanted to use a circular histogram in a recent paper of mine. The motivation is I have circular data in form of azimuths...  Continue reading Using circular dot plots instead of circular histograms