This dataset, "The voiced dental fricative in German Learner English: Dataset for chapter 9 in "Phonological variation in German Learner English"", may be reused according to the Creative Commons Attribution 4.0 International (CC BY 4.0) license as described here: https://creativecommons.org/licenses/by/4.0/.
The data contained in the tabular file "th_data_pascoe.csv" has been extracted from tables and other parts of the following academic work:
Pascoe, Graham. 1987. Die Aussprache des Englischen an bayerischen Schulen. München: Profil.
and rearranged into the tabular form in the file "th_data_pascoe.csv".
Therefore, the data from Pascoe (1987) as reused in the file "th_data_pascoe.csv" represent facts and are reused under Public Domain conditions as described here:
https://creativecommons.org/share-your-work/public-domain/pdm/.
The data contained in the tabular file "th_data_wunder.csv" are based on data extracted from the following academic work:
Wunder, Christina. 2012. Final devoicing in German Learner English: A study at a Franconian grammar school. University of Bamberg, Germany MA thesis.
These data are here reused according to the Creative Commons Attribution 4.0 International (CC BY 4.0) license as described here:
https://creativecommons.org/licenses/by/4.0/ with the permission from the author (see the file "data_consent_wunder.pdf").