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Spatial Characteristics of Serial Sexual Assault in New Zealand: A Research Study

Explore spatial behavior and offense environment consistency among New Zealand sex offenders. Data from 76 serial offenders between 1970-2002 analyzed. Results show Marauders, Commuters, Transients categories. Implications for geographic profiling systems discussed.

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Spatial Characteristics of Serial Sexual Assault in New Zealand: A Research Study

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  1. Spatial Characteristics of Serial Sexual Assault in New Zealand Dr Samantha Lundrigan Victoria University of Wellington

  2. Research Aims • To examine the characteristics of New Zealand sex offenders with respect to: • Spatial behaviour • Consistency in offence environment selection

  3. The New Zealand Context • 4million in a land area of 268,680 km sq. • 92% rural land, 8% built up. • 2001 population density of 14 per km sq.

  4. Data collection • Police files – New Zealand Police Criminal Profiling Squad • Crime scene, background and geographical information coded and mapped

  5. The sample • 76 serial offenders • Between 1970 and 2002 • Collectively 270 offences (mean of 3.5 per series) • Characteristics • 70% strangers, 20% friend/associate, 1% previous partner • Mean age of 23 (12-60) • 53% NZ Maori, 21% NZ European, 18% Pacific Island People

  6. Results

  7. Journey to crime

  8. Criminal Range r = 0.470 (P<.001)

  9. Spatial pattern • Marauders 37%, Commuters 34%, Transients 29% * p<.05 ** p<.01

  10. Environmental consistency • Variables • Type of contact site • Victim transportation • Day of week • Time of day • Distance to offence • Area type • Land use • Deprivation score

  11. Consistency score • Mean 4.56, Median 4.79, Standard deviation 1.70 • Min 1, Max 8

  12. Consistency score • 44 (57%) of offenders scored above 4, the score midpoint. • Proportional chance expected 2.5% of offenders (z=45.42, p<.0001).

  13. Future Research • More detailed analysis of environmental characteristics • Offender-offence environment consistency • Implications for Geographic profiling systems

  14. Thank you • Dr Samantha Lundrigan Institute of Criminology Victoria University of Wellington Wellington New Zealand Samantha.lundrigan@vuw.ac.nz

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