Correlations form the foundation for some of the core statistical methods relied upon for detecting patterns in data. The word correlation can refer to the general idea that two things are related, but from a statistical perspective the term has a very specific meaning. Most frequently, it is the Pearson product moment correlation that is being referenced when the term is used, but there are other types of correlations that serve different purposes. This chapter explores the various types of correlations and ways in which they can be produced within SPSS Statistics.
In the previous chapters, correlations have been among the optional statistics that can be requested. Crosstabs, for instance, has Pearson and Kendall's Tau-b correlations available under statistics. The paired t-test example in the previous chapter included the Pearson correlation as part of the...