Methodology of Longitudinal Surveys II

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Maintaining co-operation over time: Gift Giving in the Longitudinal Survey in Israel

Type:Contributed Paper
Jul 25, 09:55
  • Nerdit Stein-Kapach – Israel Central Bureau of Statistics

The Israeli Longitudinal Survey is conducted annually by the Central Bureau of Statistics as a joint project with the Bank of Israel, the National Insurance Institute, the Ministry of Finance and the Ministry of Education. The survey tracks a fixed sample of households and individuals. The Survey population includes the permanent population of the State of Israel. It includes all households in Israel and residents of institutions residing in non-therapeutic settings. The survey began its activity in 2012, and so far five waves have been interviewed.  When examining the extent of enumeration in the first four waves, a significant decrease in the number of households and individuals who responded to all the waves is apparent: Only 46% from individuals in wave 1 were responded in all 4 waves (from wave 3 to 4: decrease of 10%). Also, refusal percentage increase from 16% in wave 1 to 27% in wave 4. In order to track households and individuals over time, we need to preserve a core of respondents over time. After four waves, the response rates had declined significantly and the ability to track was impaired. The respondent population decreased compared with the original sample, which raises a difficulty about the degree of representation of respondents in the survey. Therefore, In wave 5 (2017), a gift was given to each household who answered the  interview. The gift was a digital gift-card that included options of various benefits.

Results Wave 5: 90% of households who interviewed in wave 5 agreed and received a gift. The increase in the percentage of refusal has been halted (24%),  and the decline in the number of individuals responding to all waves has moderated: 40% of individuals in the first wave, responded all 5 waves - only 6% less than the previous wave. The paper will compare the characteristics of the population that refused to respond in previous waves to those who refused in wave 5. In addition, a population that refused in several waves and was now interviewed in wave 5 will be examined, in comparison with the population that refused in wave 5 as well. The paper will examine whether there is a connection between the characteristics of the household and the decision of whether to refuse to respond or participate in the survey, and to what extent it can be recommended to provide a functional gift to a population that is difficult to interview.


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