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@article{Wobbrock2011TheEO,
  title={The effects of task dimensionality, endpoint deviation, throughput calculation, and experiment design on pointing measures and models},
  author={Jacob O. Wobbrock and Kristen Shinohara and Alex Jansen},
  journal={Proceedings of the SIGCHI Conference on Human Factors in Computing Systems},
  year={2011},
  url={https://api.semanticscholar.org/CorpusID:18568166}
}

It is found that Fitts' law is largely invariant across 1-D and 2-D, provided that univariate endpoint deviation (SDx) is used in both, but that for 2- D pointing data, bivariate endpoint deviations results in better Fitt's' law models.

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