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Information about the Survey of Dynamics and Motivations for Migration in New Zealand |
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Availability
| Valid From: .. | 10/01/2007 |
| To: .. | Ongoing |
| Frequency: .. | Irregularly |
Design
Purpose:
| Census data provides answers to many research questions on internal migration, but in this country so far there has been very limited survey information on the motivations behind people’s decisions to move or not to move and individual perceptions of the consequences of that move. Some topical research questions on internal migration are: · What types of people show greater propensity to move or not to move? · Why do people move or not move? · What are the characteristics of the internal migration flows? Information on the motivations for internal migration is of interest when informing government policy on development and sustainability. In particular, any variability of this information with respect to demographic characteristics and geographic detail will be fundamental to any sound policy debate on regional development. |
General Information ..
Target Population
The target population for the DMM Survey is the usually resident, civilian population of New Zealand aged 15 years and over and living in occupied private dwellings. This means that the survey does not provide statistics for residents of institutions (e.g. retirement homes, hospitals, prisons), residents who are temporarily staying in non-private dwellings when contact is attempted, members of the permanent armed forces, and members of the non-New Zealand armed forces. It also excludes overseas visitors who intend to stay in New Zealand for less than 12 months, New Zealand residents temporarily overseas when contact is attempted, non-New Zealand diplomats and diplomatic staff, and those aged under 15 years.
For practical reasons, the population surveyed is restricted to people whose usual residence at the time of sample selection are individuals resident in private dwellings on the North Island, South Island or Waiheke Island.
Population covered
Statistical Unit
Selection Unit
Collection Unit
Data collection for DMM was done by computer assisted interviewing (CAI). Data was collected partly by computer assisted personal interviewing (CAPI) performed by field staff for selected households (about 30 percent). The remaining households were surveyed by the use of centralised computer assisted telephone interviewing (CATI). The survey was carried out from 7 January to 7 April 2007.
Since DMM was a supplement to the HLFS, all respondents in the HLFS are asked to participate in DMM. However, individuals of the household was ineligible for DMM if the household was ineligible for HLFS.
Under Coverage
Population and Sample Size
The HLFS samples around 15,000 private households or around 30,000 individuals. Households are sampled on a statistically representative basis from rural and urban areas throughout New Zealand. The target response rate for the HLFS is 90 percent. The response rate is calculated by determining the number of eligible households who responded to the survey, as a proportion of the estimated number of total eligible households in the sample. The response rates for HLFS is lower than the target but still within acceptable bounds. The HLFS weighted response rate for the March 2007 quarter was 88.7 percent, and the proportion of these individuals responding to the DMM Survey was 87.8 percent.
The target response rate for DMM is about 80 percent which represents the minimum acceptable by Statistics New Zealand. This response rate has resulted from the proportion of eligible households responding to the HLFS being targeted at 90 percent and the proportion of these individuals responding to the DMM Survey being targeted at 90 percent. The overall weighted response rate for the DMM Survey in the March 2007 quarter was 77.9 percent (or 23,465 responses).
The DMM Personal Questionnaire contains the following sections:
· Section A: Establishes usual address of living at time of interview, and at the 2001 and 2006 Census dates. This includes stating the country of usual residence at those dates and stating whether the respondent has changed usual address in the last two years.
· Section B: Those respondents who have moved in the previous two years provide information on location of previous address, timing of move, reasons for moving from the previous location, reasons for moving to current usual address, rating of environment, housing, standard of living, social life and overall at current location compared with previous usual address, living arrangement at current time and at the time of the move, occupation at current time and at time of move from previous address, and change in income as a result of the move. The respondent is then asked whether he/she is planning to move within the next two years.
· Section C: Those respondents who have arrived from overseas within the previous two years provide information on country (state if Australia) of living before coming to NZ, length of stay in the country, timing of arrival in NZ, location of settlement in NZ, reasons for coming to NZ, reasons for choosing to live at current usual address, and length of stay at current address.
· Section D: Those respondents who have not moved in the previous two years provide information on length of stay at current usual address, reasons for staying at the current usual address, rating of environment, housing, standard of living, social life and overall at current location, living arrangement at current time and two years ago, occupation at current time and at time of move from previous address, and change in income compared with two years ago. The respondent is then asked whether he/she is planning to move within the next two years.
· Section E: Those respondents who have moved or have arrived from overseas in the previous two years provide reasons for choosing to live at their current address. The main reason is also given. Respondents provide rating of environment, housing, standard of living, social life and overall at current location compared with previous overseas usual address.
· Section F: Those respondents who have moved or arrived from overseas in the previous two years provide information on living arrangement at current time and at the time of the move to current address or NZ, occupation at current time and at time of move from previous address or overseas address, and change in income as a result of the move to current address or NZ. The respondent is then asked whether he/she is planning to move within the next two years.
· Section G: Those respondents who are planning to move within the next two years provide information on where they are planning to move (country, state, location within NZ), timing of move, reasons for planning to move, country of birth and income level.
· Section H: Those respondents who are not planning to move within the next two years provide information on reasons for wanting to stay at the same usual address, country of birth and income level.
Reasons for moving or not moving have been coded according to a set of classifications that has been developed for the purposes of the DMM Survey.
A main advantage of the DMM Survey being a supplement to the HLFS is the availability of many core variables in HLFS that can be merged with responses to the DMM Survey. In this release HLFS information on age, sex, ethnicity, marital status, occupation and address of usual residence have been merged with respondent information from DMM.
Output Variables
Output variables are pieces of individual information that can be extracted from the survey/output data. Often output variables can be cross tabulated with other output variables, for example sales by industry classification. The list below contains all current and past output variables which have been released for this survey/output.
Information structure
(questionnaire)
Changes in Output Variables over time
Guide to Interpreting Data
Summary of Changes to Survey/Output ..
Usage and Limitations of the Data ..Information at national level is readily available for this survey. However, information on reasons for moving to or from a specific regional council will be limited to reasons for moving between groupings of regional councils. Similarly, other survey information will be limited at the multi-variable level.
Related Data Sources ..The census provides information on people’s current location, location five years ago and their current socio-economic and demographic characteristics. Census does not provide information on why people have moved or why they have remained at the same address, and how the outcome of the move has been perceived by the individual. There is also a lack of information on intermediate moves within the five-year period, how often people have moved and intentions to move.
Sampling Errors ..Sampling error quantifies the variability that occurs by chance because a sample rather than an entire population is surveyed. Sampling errors have been estimated using a jackknife method which is based on the variation between estimates based on different sub-samples taken from the whole sample. This is an attempt to see how estimates would vary if we were to repeat the survey with new samples of individuals. The sample errors have been estimated at the 95 percent confidence level. Thus for each cell we are 95 percent confident that the true population value lies within one sampling error of the estimated cell value. Relative sample errors give a percentage measure of the magnitude of the error, obtained by dividing the absolute sample error by the size of the cell of interest.
Information on sample errors for each data cell provided in the set of downloadable tables is available on request. Smaller estimates, such as in tabulations of movers from overseas, are subject to larger relative sampling errors than larger estimates. Output tables include descriptors on all data that exceed a certain level of relative sample error as follows:
S Denotes data suppressed for reliability and confidentiality reasons. Sample errors for these data cells are in excess of 75 percent of cell values and reflect a low number of responses (12 or fewer).
* Denotes data with relative sampling error ranging from 50 to 75 percent and should be used with caution.
Non-sampling errors Non-sampling error is very difficult to measure; it arises from biases in the patterns of response and non-response, inaccuracies in reporting by respondents, and errors in the recording and coding of data. Statistics New Zealand endeavours to minimise the impact of these errors through the application of best survey practices and monitoring of known indicators (e.g. non-response).
Caveats on Release ..
Customised Output
Catalogue & Reference Numbers
Classifications | Classification Versions | Classification Type |
AGEGPS - Age - 5 Year Groupings | V1.0 | Standard |
ETHNIC05 - Ethnicity New Zealand Standard Classification 2005 | V1.0 | Standard |
NZSCO99 - New Zealand Standard Classification of Occupations 1999 | V1.0 | NZ Standard |
REGC06 - Regional Council 2006 | V1.0 | NZ Standard |
SEX - Sex - New Zealand Standard Classification | V1.0 | NZ Standard |
Glossary of Terms
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Contact Details
| Customer Service E-mail Contact: | info@stats.govt.nz |
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| Survey Enquiries E-mail Contact: | demography@stats.govt.nz |
Liability
Statistics New Zealand gives no warranty that the information or data supplied contains no errors. However, all care and diligence has been used in processing, analysing and extracting the information. Statistics New Zealand shall not be liable for any loss or damage suffered by the customer consequent upon the use directly, or indirectly, of the information supplied in this product.
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