I was recently given a green light by my former supervisor to conduct an analysis on individual patient data from their recently published trial for a stats class assignment (Msc). The idea was we could flip the assignment into a research letter/full manuscript if the results are interesting. I didn't describe the full analysis since I knew it would be enough to just give them the overall jist.
I later called my former colleague, the clinical trial coordinator, to describe the data I needed, the analysis I was going to do (more detailed), and discuss data security since it was a group project. I mentioned if my members could not have access to the data, I could do the analysis myself since I had already signed confidentially etc in the past. The coordinator then told me the question/hypothesis I was asking was something s/he wanted to see done but did not have the statistical expertise to do. I want to emphasize here that the coordinator does not have a methodology background and was not familiar with the analyses/methods that I described but just thought what I wanted to do is like what they had imagined.
However, a few hours later, I receive an email from my former supervisor that is clearly written by the coordinator saying that on further consideration, the analysis I was going to do probably belongs in a secondary paper that '[they] want to do'. Complete 180 and phrased 'we' exclusive since I am no longer part of the team. Now, its common for my old supervisor to delegate decision making / email writing to his staff as s/he is a busy clinician so there isn't any uncertainty around the email. They have also offered me an alternative data set for my class but I cant help but feel robbed.
What do I do?