You will find programs for taxometric analyses here. These programs work with SPSS and R. You conduct the analyses in SPSS using our GUIs; SPSS calls the R program to do the "heavy lifting" using John Ruscio's taxometrics package.
A more detailed description of these packages may be found in our 2016 APS presentation here.
Detailed instructions on installing the .SPD files are coming soon. We have tested our GUIs with SPSS 23.