There are errors in the fifth paragraph under the “Double response approach” heading of the Proposed Procedures section of this article: The expressions for optimum sample sizes and optimum variance were derived incorrectly. The correct paragraph is:
Citation: The PLOS ONE Staff (2014) Correction: Additive and Subtractive Scrambling in Optional Randomized Response Modeling. PLoS ONE 9(6): e101308. https://doi.org/10.1371/journal.pone.0101308
Published: June 19, 2014
Copyright: © 2014 The PLOS ONE Staff. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.