I usually tell my students that the SPSS pedagogy is the following: We will present the results using the worst possible defaults so that users are forced to deeply understand and tweak everything to not make a fool of themselves. There sure is a lot of normality checking going on (and then some), but how much of it is relevant for APA-reporting? SPSS output is bloated and difficult to convert to APA-style It’s so long that I had to split it into three columns and scale it down to fit it into this blog post. Seriously, why is the Shapiro-Wilk test hidden under “Descriptive statistics” (it’s inferential!) and “Plots” (it’s a table!)? Try motivating students to test assumptions using SPSS. Then scroll down through several tables and see if you can find the test of normality. Then head to Analyze → Descriptives → Explore → Plots → Normality plots with test and run the analysis on the newly computed “diff” column. Then compute that difference using Data → Compute variable… → diff = var2 – var1. SPSS: Realize that a paired-samples t-test corresponds to a one-sample t-test of the pairwise differences. Let’s count the number of clicks to test normality in JASP: ooone… oh, it’s done already! JASP: click “Normality” under the aptly named section “Assumption checks.” Testing assumptions in SPSS is ridiculousĬompare the procedure for testing the normality assumption in a paired samples t-test in JASP and SPSS: I have yet to experience a single student who cannot get JASP running.
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JASP is free, thus avoiding license problems.
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Students messing up licensing and having install problems cause a lot of wasted time. In addition, we usually see 3-5 students every year who simply cannot get SPSS working. SPSS requires a campus license which needs to be activated and updated ever so often. One small click in JASP a major improvement over SPSS. So don’t use SPSS if you want to publish.
Reporting effect sizes and intervals is not just a cornerstone of APA publishing guidelines it’s also important for the “new statistics” movement. Furthermore, SPSS cannot compute confidence intervals on Cohen’s d, Pearson’s r, Spearman’s rho, Mann-Whitney U, Wilcoxon’s matched pairs, Wicoxon’s signed-rank test, Binomial proportions nor show confidence intervals on ANOVA interaction plots. How JASP is better than SPSS SPSS is APA-incompatible
Also, consistency with the publishing guidelines of the American Psychological Association (APA) matters since that’s how students are supposed to write their reports and papers.
Ease of learning and use matters since it allows more mental resources for statistical understanding. My approach for this review is as a university lecturer in psychology.
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How does an expensive IBM-developed program compare to the free and open source program which was until recently just developed by a handful of scientists? The first version of JASP was published three years ago. The first version of SPSS was published 59 years ago.
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