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Sample Details

Details about the sample collected during each wave of the NZAVS

Wave 01 - 2009


  • In 2009, the NZAVS randomly sampled a total of 6,518 registered voters from the New Zealand electoral roll.
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Wave 02 - 2010


  • In 2010, the NZAVS sampled 4,441 people, with 4,425 people retained from Wave I (retention rate from Wave I = 68%).
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Wave 03 - 2011


  • Wave 3. In 2011, the NZAVS sampled 6,884 people, with 3,918 people retained from at least one previous wave, 2,966 new participants, and 3,916 retained from Wave I (wave-to-wave retention from previous year = 79.5%).
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Wave 04 - 2012


  • In 2012, the NZAVS sampled 12,179 people, with 6,807 people retained from at least one previous wave, 5,374 new participants, and 4,053 retained from Wave I (wave-to-wave retention from previous year = 83.7%).
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Wave 05 - 2013


  • In 2013, the NZAVS sampled 18,261 people, with 10,502 people retained from at least one previous wave, 7,759 new participants, and 3,934 retained from Wave I (wave-to-wave retention from previous year = 80.8%).
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Wave 06 - 2014


  • In 2014, the NZAVS sampled 15,820 people, with 15,740 people retained from at least one previous wave, 82 new participants, and 3,728 retained from Wave I (wave-to-wave retention from previous year = 81.5%).
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Wave 07 - 2015


  • In 2015, the NZAVS sampled 13,942 people, with 13,941 people retained from at least one previous wave, 1 new participant, and 3,345 retained from Wave I (wave-to-wave retention from previous year = 79.3%).
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Wave 08 - 2016


  • In 2016, the NZAVS sampled 21,936 people, with 13,781 people retained from at least one previous wave, 8,157 new participants, and 3,347 retained from Wave I (wave-to-wave retention from previous year = 85.59%).
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Wave 09 - 2017


  • In 2017, the NZAVS sampled 17,072 people, with 16,931 people retained from at least one previous wave, 141 new participants, and 2,771 retained from Wave 1 (wave-to-wave retention from previous year = 72.0%).
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Wave 10 - 2018


  • Wave 10 is currently underway, and includes a large booster sample contacting and inviting 325,000 people to join the study.
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