Am I allowed to extract data published in a thesis and reanalyze it? I would combine with my own data and the analyses would be much different than the original thesis.
If you have relevant links please share!
Please note this is different from: Can I use published data by other authors in my study? as it is specifically referring to a thesis.
Yes
There're lots of papers that iterate on publicly-available data. For example, the MNIST dataset is a dataset of labelled handwritten digits which different machine learning researchers have attempted to optimize their algorithms on. Similarly, telescopes like the Planck probe produces data which other astronomers use to do their analyses.
There is no prohibition against using data.
