Released this week, JASP version 0.8.2.0 brings a number of improvements. For data visualization, the most prominent advance is the extension of the “split-by” functionality (courtesy of JASP team member Erik-Jan van Kesteren). To demonstrate how it works, we plot data from a study conducted at the University of Melbourne in the 1970s, examining the possible relation between hair color and pain threshold (McClave & Dietrich, 1991, Exercise 10.20). The data contain estimates of pain tolerance for participants of four different hair colors: dark brunette, light brunette, dark blond, and light blond.
After opening the data file we navigate to Descriptives > Descriptive Statistics and find the new “split-by” option below the Variables box.
In the previous version of JASP we could only obtain descriptive statistics collapsed over all four hair colors. To illustrate, we move “Pain Tolerance” to Variables and find the following table:
Clearly, this table does not provide useful information about the differences between hair colors. The “split” functionality overcomes this limitation. We move “Hair Color” to Split, and then obtain a more informative table:
The numbers in this table suggest that pain tolerance differs between the four hair colors. Dark brunettes have a mean tolerance of 37.4, while light blondes score much higher with a mean threshold of 59.2. In addition to producing more informative tables, the split option works for every type of plot in the Descriptive Statistics analysis. As an example, we first create a boxplot without the split option:
And with the split option:
We hope you enjoy this new feature and all the other improvements that this version of JASP has to offer.
References
McClave, J. T., & Dietrich, F. H. II. (1991). Statistics. San Francisco: Dellen Publishing.
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