Bias in Internet-Based Surveys - -A Comparative Study Using the Census and an Interview-Based Survey- - Masaki Taniguchi

In order to clarify the characteristics of Internet-based survey respondents, the project discussed here conducted an interview-based survey using random sampling and an Internet-based survey with target collection numbers for gender and age group, using the same survey items and the same survey timing. [...] The analysis revealed that, compared to the census results, the Internet-based survey showed bias in items such as area of residence and educational background, while the interview-based survey showed bias in home ownership rate. [...] ⚫ When the Internet-based survey was weighted using a propensity score method (a correction method based on census data), no significant changes were observed in either the interview-based or Internet-based surveys in the distribution of such variables as the rate of long-term political partisanship (support for a specific political party), the rate of support for the Cabinet, the degree of life s. [...] On the other hand, a correction effect of more than 15 minutes in the interview-based survey and several minutes in the Internet-based survey occurred in the average daily Internet usage time. [...] The analysis revealed that, compared to the census results, the Internet-based survey showed bias in items such as area of residence and educational background, while the interview-based survey showed bias in home ownership rate.