Technical information

The information in this section will help you understand how the New Zealand Crime and Safety Survey (NZCASS) is conducted and how you can interpret and use the results.

Click on the headings below to read more about each topic.

The NZCASS technical manual has even more detail. [PDF, 5.3 MB]

Methodological overview

The main things you need to know about how the NZCASS is conducted.

How to interpret and use NZCASS results

What users need to be aware of:


What you need to know about NZCASS sampling.

Fieldwork processes

How NZCASS interviews are carried out.

Offence coding

How the incidents collected as part of the NZCASS are coded into offences for analysis and reporting.


What weighting is applied to NZCASS data.


What imputation is, why it is done and how it affects users when interpreting NZCASS statistics.

Classifications, groupings and standards

What classifications, groupings and standards are used for analysis and reporting.

Terms and definitions

What terms and concepts mean.

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