Supplemental materials for preprint: Delaying Access to a Problem-Skipping Option Increases Effortful Practice: Application of an A/B Test in Large-Scale Online Learning

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**Preprint** is available for download, in case the [published version][1] cannot be accessed. **R scripts** are available for inspection (.html) or reproduction (.Rmd). **Data** are available, both the practice set and test set. Anything else? Get in touch! Regards, Alexander Savi [1]: https://doi.org/10.1016/j.compedu.2017.12.008

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