Abstract
Code theory is widely used to construct optimal designs in recent years. In this paper, two transformations, a modified Gray map and a mapping between quaternary codes and the sequence of three binary codes for four-level designs, are considered. Via the two transformations, we point out that the wrap-around \(L_2\)-discrepancy values of the two-level designs corresponding to a four-level design are decided by the four-level design, two new analytical expressions of the wrap-around \(L_2\)-discrepancy for the derived two-level designs are built, and some new lower bounds of the wrap-around \(L_2\)-discrepancy for four-level and two-level designs are obtained, which can be used as a benchmark for search the uniform designs and evaluate the uniformity of designs. Furthermore, based on the second transformation, we provide a very strong link between the aberration of a four-level design and the uniformity of the derived two-level design.
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Acknowledgements
The authors would like to thank an associate editor and the referees for their comments and suggestions which helped to improve this paper. This work was partially supported by the National Natural Science Foundation of China (Nos. 11701213; 11561025), Natural Science Foundation of Hunan Province (Nos. 2017JJ2218; 2017JJ3253) and Excellent Doctor Degree Dissertation Training Project of Central China Normal University (No. 2017YBZZ060).
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Li, H., Qin, H. New lower bounds of four-level and two-level designs via two transformations. Stat Papers 61, 1231–1243 (2020). https://doi.org/10.1007/s00362-018-0987-z
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DOI: https://doi.org/10.1007/s00362-018-0987-z