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Correction: Additive and Subtractive Scrambling in Optional Randomized Response Modeling

  • The PLOS ONE Staff

Correction: Additive and Subtractive Scrambling in Optional Randomized Response Modeling

  • The PLOS ONE Staff
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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:

Consider,

Using Lagrange approach to minimize under the restriction that , we get:and

With these optimum sample sizes, the minimum value of is given by:where .

Reference

  1. 1. Hussain Z, Al-Sobhi MM, Al-Zahrani B (2014) Additive and Subtractive Scrambling in Optional Randomized Response Modeling. PLoS ONE 9(1): e83557