A new non-randomized model for analysis sensitive questions with binary outcomes

Guo Liang Tian, Jun Wu Yu, Man Lai TANG*, Zhi Geng

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

35 Citations (Scopus)


We propose a new non-randomized model for assessing the association of two sensitive questions with binary outcomes. Under the new model, respondents only need to answer a non-sensitive question instead of the original two sensitive questions. As a result, it can protect a respondent's privacy, avoid the usage of any randomizing device, and be applied to both the face-to-face interview and mail questionnaire. We derive the constrained maximum likelihood estimates of the cell probabilities and the odds ratio for two binary variables associated with the sensitive questions via the EM algorithm. The corresponding standard error estimates are then obtained by bootstrap approach. A likelihood ratio test and a chi-squared test are developed for testing association between the two binary variables. We discuss the loss of information due to the introduction of the non-sensitive question, and the design of the co-operative parameters. Simulations are performed to evaluate the empirical type I error rates and powers for the two tests. In addition, a simulation is conducted to study the relationship between the probability of obtaining valid estimates and the sample size for any given cell probability vector. A real data set from an AIDS study is used to illustrate the proposed methodologies.

Original languageEnglish
Pages (from-to)4238-4252
Number of pages15
JournalStatistics in Medicine
Issue number23
Publication statusPublished - 15 Oct 2007

Scopus Subject Areas

  • Epidemiology
  • Statistics and Probability

User-Defined Keywords

  • A-optimality
  • Bootstrap
  • Constrained MLE
  • EM algorithm
  • Randomized response technique
  • Sensitive question
  • Survey sampling


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