This essay confines various problems in erhu fiddle performance to two major categories : rational problems and perceptual problems through analyzing and categorizing .

This paper discussed an investigating method of quantitative and sensitive questions.

There have been many randomized response(RR) strategies about sensitive questions so far.

Basing on the random amputation model,in order to protect the privacy of respondents,we proposed an advanced randomized response technique for investigating the quantitative characteristic for sensitive questions,and compared the accuracy of advanced model to random amputation model and random amputation Warner model.

This paper introduces an advanced random response model in sensitive question,and uses Bayesian methods in valuing the parameter,and finally obtains the parameter approximation.

This paper studies the survey sampling on sensitive question with quantitative characteristic, designs two randomized response models in view of discrete uniform distribution and uniform distribution.

This paper presents an improved method of Simmons model with regard to the attribute sensitive question, including random method and determinate method, and then discusses its statistical properties and applicable ranges respectively.

An investigation and analysis method of sensitive problems;

There are two major ways of investigation on sensitive problems in market survey: Greenberg (1971), Himmelfarb and Edgelll (1980) .

Stratified two-stage cluster sampling on unrelated question model for quantitative sensitive questions

The paper proposes a simple and convenient questionnaire design technique of sensitive questions survey.