how to compare groups using spss data how to determine difference between groups in a posttest with spss which is an independent variable of spss how to assess differences in groups using spss sss how to find the difference between a post test and a pretest how to compare the differences between groups in a pretest can independent variables be grouped as a pre or post test? how to test differences in two groups using spss how to assess differences between group in post-test design how to group an independent variable using spss how to group independent variable how to compare two variables in a pretest how to determine differences in spss how to determine whether a group is independent or dependent how to group a pre test how to determine the difference of a group how do you compare two groups which variable is split into three groups in spss? how to split groups in spss how to divide a randomised controlled trial into groups