Carry out initial statistical analysis of the human data

[GiulioCusenza]

Steps:

• [x] Merge the data annotated so far into one file
• [x] Analyse task differences by component (e.g. structure should be relevant mainly for brainstorming tasks)
• [x] Analyse component differences by task (other point of view)
• [ ] Report the results in a few bullet points, including considerations as to why we think there are such differences
• [ ] Write the paper's paragraph about the statistical analysis
• [ ] (Review in the light of newly annotated data)

[GiulioCusenza]

with @GiulioCusenza