Relevance and research question: Nowadays, Household surveys such as the Labor Force Survey or the Household Finances and Living Conditions Survey face rising “response burden” in Korea. In order to reduce this response burden, Statistics Korea is using a mixed mode survey in the Household survey. But we have questions concerning how much difference exists in the effects of these various modes. Also, how can we design mixed mode surveys in order to reduce these differences. With experimental surveys for mixed mode effects, we are redesigning our mixed mode survey process and are trying to discover the best statistical method to estimate mixed mode effects.

Methods and Data: We conducted a pilot survey for research mode effect. We designed a pilot survey with two survey modes: a face to face interview and an Internet survey. And we added two selection modes with the Household survey, one allowing us to select the survey mode and one not allowing us to do so. Finally, we designed four survey modes, which allowed selecting the face to face interview survey or the internet survey. We sampled 1,600 household members randomly. 800 households selected the interview or internet survey, and the others did not select one particular mode. We provided the questionnaire which included general social survey questions The total number of questions is up to 60.

Results: Finally we collected data from 766 household members with response rates of almost 42%. In some questions, there were mode effects between the face to face interview and the internet surveys. For example, concerning the question “How many times do you contact with your parents in a week”, the respondents doing the internet survey less had less contact than those who opted for the face to face interview. We can show more results which contain mode effects.

Added value: Using the results of the pilot survey, we can redesign the process surveying with mixed mode surveys. Also, we can apply an estimate to the mixed mode data.