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

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Presentation on theme: "Spatial Characteristics of Serial Sexual Assault in New Zealand Dr Samantha Lundrigan Victoria University of Wellington."— Presentation transcript:

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% Measure Marauders (median km) Commuters (median km) Mean distance travelled**2.365.78 Min distance travelled*0.180.91 Maximum distance travelled**4.7511.73 Mean Interpoint Distance12.894.40 Max distance between offences20.288.73 Min distance between offences*01.170.32 * 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 ScoreNCum% 0≤ 2 810.5 2≤ 4 2442.1 4≤ 6 3182.9 6≤ 8 13100.0

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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