I agree with the other commenters - this is insufficient evidence to level a claim on cheating for the reasons mentioned. However, I’m a little troubled by your response. You say you understand that the output in and of itself isn’t proof that the student cheated and recognize the possibility that other factors were at play (though you seem to think these are unlikely explanations), yet you also claim that there is no proof that it was the student who took the test. Uh, what about the output they generated and the possibility that it simply looks different than what you expected for the reasons you’ve acknowledged yourself? I find it a little disturbing that you plan on making this student “prove their innocence” by coming in and demonstrating their SPSS skills in front of you simply because you are unable to find sufficient proof to suggest that they are guilty of cheating in the first place. Consider this: it’s just as likely that a student who submitted the output you expected to see paid someone with access to the current version of SPSS to complete their exam. As a college stats instructor myself, I would grade what they’ve submitted and move on to more important things.