In this chapter, we focus on different ways of comparing groups (and measurement points/samples). We start with some descriptive statistics, including box plots and crosstables. The chapter continues with how to perform t-tests and one-way ANOVA (including their non-parametric alternatives), as well as chi-square tests.

Before you start comparing groups (or measurement points/samples), it is important to know about the variables’ measurement scale and distribution (as discussed in Basic statistical concepts). For an overview, see the figure below.