Labour Force Survey 2007, 3rd quarter

Labour Force Survey 2007 - 3rd quarter.

As of the 1st quarter of 1972, SSB has conducted official quarterly labour force surveys (AKU). These surveys aim to give the labour force authorities (and other people interested) knowledge of the occupational structure of the population and how it develops over time. The surveys are meant to give a foundation and statistical material for occupational prognoses and labour research. The samples in AKU are from 1992 representative at county level. In the period 1972-1991 they were representative on county pair level.

As from January 2006 some major changes were introduced to AKU in order to enhance its comparability to similar surveys in other countries. The changes consist of minor definitional adjustments of unemployment, some adjustments and enlargement of the questionnaire and a change in age definition (age at reference point instead of at the end of the year). Simultaneously the lower age limit to be included in AKU was lowered from 16 to 15 years. This led to some breaks in the time series in the aforementioned areas.

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Originally, AKU respondents were interviewed in two consecutive quarters of a year, followed by a pause of two quarters, and then another two quarters of interviews. The sample was approximately 10-11.000 respondents in each quarter up until 1988. Originally, AKU was intended to be an analytical supplement to the monthly occupational statistics that was based on the social security membership index file. However, the social security-based statistics disappeared when the sickness benefit was included in the National Insurance as of 1st of January 1971, and AKU has after gradually developed into the most significant source of knowledge of the state of the labour market and its development.

In 1975, Statistics Norway changed the sampling frame of survey research, see article 37: “Om bruk av stikkprøver ved kontoret for intervjuundersøkelser”, SSB (About the Use of Random Samples at the Office for Survey Research, Statistics Norway) by Steinar Tamsfoss, and SØS 33: “Prinsipper og metoder for Statistisk sentralbyrås utvalgsundersøkelse (Principles and Methods for Statistics Norway's sample research) by Ib Thomsen. Simultaneously, the method for estimation of inflation to national numbers was changed, so that reasonable numbers for regions do exist from 1975 and onwards. The change in 1975 led to a different way of interviewing in groups. This caused amongst other things a break with the AKU panel systematics.

In the AKU survey of 1976, a slightly changed questionnaire was introduced. Also, there was a return to the original 6-quarter rotation scheme. The new questionnaire implied a better identification of family workers and persons that are temporarily without paid work. Thus, 30-35 000 more people were defined as employed. The group of "job-seekers without income" were also extended to include persons that were on an involuntary leave of absence. The questions concerning underemployment and “over employment” in the original questionnaire were abandoned.

From the 1st quarter of 1987, the estimation method (inflation to national numbers) was slightly changed. There was also a minor adjustment in the definition of employment. In order to ensure that the numbers were to be comparable to earlier surveys, new versions of the 1980-1986 AKU-files were drawn up. Consequently two versions of the 1980-1987 files - respectively with the old and new methods of estimation - exist. The “old” means that the data are comparable to the original numbers published in the period of 1972 - 1987, whilst the “new” implies that the data are comparable to numbers published after 1987.
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Between the 1st and 2nd quarter of 1988, the AKU file description was changed. The variable “Labour-market status” was given a different coding. In addition, adjustments in the data collections were made - from interviewing a specific week every quarter to carry out continuous weekly interviews. SSB also started up an escalation scheme to increase the sample size. This affected the weights, and from the 2nd quarter of 1988, these were recalculated monthly. To balance out the quarterly or yearly files to total national numbers, the monthly weights therefore had to be divided in three or twelve to give the correct total number.

In 1996, AKU was significantly revised: The questionnaire, the file description and the standard for coding of industry and occupation. The data collection also changed to CATI - Computer Assisted Telephone Interviewing. A new classification of industry was put into use (NOS C 182, based on the EU standard NACE, Rev.1). This standard was updated in 2002 and 2007. Also, the new Norwegian standard classification of occupations (STYRK) based on ISCO 88 was used from 1996 and onwards. The variable indicating socio-economic status was omitted, as a similar variable was not developed in the new occupational classification.

2007年第三季度劳动力调查

自1972年第一季度起，挪威统计统计局（Statistics Norway，简称SSB）便开展官方季度劳动力调查（以下简称AKU）。此类调查旨在为劳动力管理部门及其他相关方提供人口职业结构及其随时间演变的相关信息，同时为职业预测与劳动力研究提供基础数据与统计资料。1992年起，AKU的抽样样本以县级为单位实现代表性；1972年至1991年期间，样本则以双县级为单位实现代表性。

2006年1月起，AKU迎来多项重大调整，以提升其与其他国家同类调查的可比性。调整内容包括：对失业定义进行小幅修正，对调查问卷进行优化与扩容，以及更改年龄统计口径（采用调查基准时点年龄而非年末年龄）。同时，AKU的纳入年龄下限从16岁下调至15岁。上述调整导致上述统计领域的时间序列出现若干断点。

AKU最初的受访样本采用轮换调查模式：一年内连续两个季度开展访谈，随后暂停两个季度，再进行两个季度的访谈。1988年之前，每季度的受访样本量约为10000至11000人。AKU最初旨在作为基于社会保障参保索引文件的月度职业统计的分析补充。然而，1971年1月1日病假津贴纳入国民保险体系后，基于社会保障的月度职业统计便不复存在，AKU也逐渐演变成为了解劳动力市场现状及其发展态势的核心信息来源。

1975年，挪威统计统计局调整了调查研究的抽样框架，相关细节可参见Steinar Tamsfoss撰写的SSB第37号文章《关于调查研究办公室的随机抽样应用》（原文挪威语标题：*Om bruk av stikkprøver ved kontoret for intervjuundersøkelser*），以及Ib Thomsen撰写的SØS 33号文件《挪威统计统计局抽样调查的原则与方法》（原文挪威语标题：*Prinsipper og metoder for Statistisk sentralbyrås utvalgsundersøkelse*，英文译名为*Principles and Methods for Statistics Norway's sample research*）。与此同时，全国层面的数值推算方法也进行了调整，自此1975年起可生成具备合理性的区域统计数据。1975年的调整改变了群体访谈的方式，其中一项直接后果便是打破了AKU的面板调查体系。

1976年的AKU调查启用了小幅修订后的调查问卷，同时恢复了最初的6季度轮换调查模式。新版问卷能够更好地识别家庭帮工与临时无薪就业人员，因此新增了30000至35000名就业人口统计对象。“无收入求职者”群体的统计范围也得到扩充，纳入了非自愿休假的人员。原版问卷中关于就业不足与“过度就业”的相关问题则被移除。

1987年第一季度起，全国数值的推算方法进行了小幅调整，同时对就业定义也做出了微调。为确保数据与此前调查的可比性，研究人员编制了1980年至1986年AKU数据集的新版文件。因此1980年至1987年的AKU数据集存在两个版本：分别采用旧版与新版推算方法。其中“旧版”数据可与1972年至1987年发布的原始统计数据进行对比，而“新版”数据则可与1987年之后发布的统计数据进行对标。

1988年第一季度至第二季度期间，AKU的数据集描述规则进行了调整，“劳动力市场地位”变量的编码方式发生变更。此外，数据采集模式也进行了优化：从每季度固定一周开展访谈改为连续每周开展访谈。挪威统计统计局还启动了样本扩容计划，这对样本权重产生了影响，自1988年第二季度起，样本权重改为每月重新计算一次。为使季度或年度数据集的汇总值与全国总数值保持一致，需将月度权重分别除以3或12，以得到正确的汇总数值。

1996年，AKU迎来重大修订，涉及调查问卷、数据集描述规则以及行业与职业编码标准。数据采集方式也改为计算机辅助电话访谈（Computer Assisted Telephone Interviewing，简称CATI）。新版行业分类标准（NOS C 182）正式启用，该标准基于欧盟NACE Rev.1标准，并分别于2002年与2007年进行了更新。1996年起，挪威正式启用基于国际职业分类标准ISCO-88的新版职业分类标准（STYRK）。由于新版职业分类体系未开发对应的社会经济地位变量，原体系中的社会经济地位变量被移除。