Labour Force Survey 1st quarter 1986 - 2nd quarter 1987, panel file, recoded

SSB has conducted official quarterly labor force surveys (LFS) from Q1 1972. The survey aims to provide labor authorities and others knowledge about the occupational structure of population and development over time. The surveys provide the basis and statistical material for occupational forecasting and labor market research. In the LFS respondents are interviewed two consecutive quarters, then after two more quarters they are interviewed again in two consecutive quarters. Labour Force Survey 1972 is the first complete LFS year long survey. Originally it was intended that such statistics would be a more analytical supplement to the monthly employment statistics based on the insurance fund membership files. The insurance fund-based statistics, however, fell away when health insurance was included in the National Insurance Scheme from 1 January 1971, the LFS has gradually evolved to become the main source of knowledge about the state of the labor market.

General information on the Labour Force Survey: http://www.nsd.uib.no/data/ny_individ/norStudy/aku.html

Overview of LFS panels with detailed explanation for panel files:

Group 1977|1978|1979|1980|1981|1982|1983|1984|1985|1986|1987|
Quarter 1234 |1234|1234|1234|1234|1234|1234|1234|1234|1234|1234|
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52 |____|____|____|____|____|____|___X|X__X|X___|____|____|____| 599_1 = 1985,1
53 |____|____|____|____|____|____|____|XX__|XX__|____|____|____| 599_2 = 1985,2
54 |____|____|____|____|____|____|____|_XX_|_XX_|____|____|____| 599_3 = 1985,3
55 |____|____|____|____|____|____|____|__XX|__XX|____|____|____| 599_4 = 1985,4
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56 |____|____|____|____|____|____|____|___X|X__X|X___|____|____| 600_1 = 1986,1
57 |____|____|____|____|____|____|____|____|XX__|XX__|____|____| 600_2 = 1986,2
58 |____|____|____|____|____|____|____|____|_XX_|_XX_|____|____| 600_3 = 1986,3
59 |____|____|____|____|____|____|____|____|__XX|__XX|____|____| 600_4 = 1986,4
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60 |____|____|____|____|____|____|____|____|___X|X__X|X___|____| 601_1 = 1987,1
61 |____|____|____|____|____|____|____|____|____|XX__|XX__|____| 601_2 = 1987,2
62 |____|____|____|____|____|____|____|____|____|_XX_|_XX_|____| 601_3 = 1987,3
63 |____|____|____|____|____|____|____|____|____|__XX|__XX|____| 601_4 = 1987,4

Panel files are created by linking four interviews from an ordinary interview round in LFS. In the table above this means that one could connect all the groups (lines) marked X.
Group 1 is removed because the intweviews started 4th quarter 1971.
Participation 4 times is used as a selection criterion, therefore everyone that didn't participate in the 4th interview has been omitted.
In 1975 SSB changed selection strategy. The groups that were left out due to this (started in 1973 or 1974, should've had one or more interviews in 1975) are removed.

Looking at a particular column, for example. Q1 1983, we will see that 1/4 of respondents are included for the 4th time, the 3rd time etc. The total sum of the material for one quarter. Quarterly weights allows one such block (column) to be balanced with national figures. If taking 4 groups and turning them into a year file the weights must be divided by 4 to give proper weighted figures.

Panel files goes in the other direction (horizontally) and each panel will have four weights, one for each quarter, and although they do not differ much will they be prepared independently and each weight should be used only for data from the quarterly weight is made. Weighted figures are for a pool, ie ca. 25% of the total quarterly sample and must therefore multiply by 4 to get approximately the national quarterly.

With "almost national quarterly" means that since panel connectors innebærerer a certain selection, as it may cause minor differences from the weighted national figures one gets for each quarter

This panel file covers group 61 in the table above. The file itself is created later, based on a file description from 1988; the weights in the original file is created to be used on months.

Between the 1st and 2nd quarter of 1988 there was a reorganization of the LFS including resulted in a new file description, and that the status codes for status in the labor market changed. The present panel file is located exactly at the forefront of this change, but still follows essentially the file description that was prepared for the change. This has practical reasons, the 9 panel files have the latest interview from Q1 1987 to Q1 1989 was compiled together and transmitted simultaneously from SSB to NSD. However, it created two versions of these panel files: Because the V009, V036 and V073 (status on the labor market) is changed, the data also recoded to obtain comparable data before and after the adjustments between the 1st and 2nd quarter 1988
NSD0603 provides data with original codes, NSD0604 provide encoded data, the entire 1987 and 1988 codes that are comparable with subsequent encoding.

SSB自1972年第一季度起开展官方季度劳动力调查（Labor Force Survey，LFS）。该调查旨在为劳动主管部门及其他相关方提供关于人口职业结构及其随时间演变的信息，为职业预测与劳动力市场研究提供基础数据与统计资料。在LFS中，受访者需连续两个季度接受访谈，间隔两个季度后，再连续两个季度接受访谈。1972年劳动力调查是首个完整的年度LFS调查。最初，此类统计数据拟作为基于保险基金成员档案的月度就业统计的补充，以增强分析性；但1971年1月1日医疗保险纳入国家保险计划后，基于保险基金的统计数据逐步停用，LFS遂发展为劳动力市场状况的核心信息来源。

劳动力调查概述：http://www.nsd.uib.no/data/ny_individ/norStudy/aku.html

劳动力调查面板概述及面板文件（panel files）详细说明：

Group 1977|1978|1979|1980|1981|1982|1983|1984|1985|1986|1987|
Quarter 1234 |1234|1234|1234|1234|1234|1234|1234|1234|1234|1234|
---------------------------------------------------------------------------------------------------------------
52 |____|____|____|____|____|____|___X|X__X|X___|____|____| 599_1 = 1985,1
53 |____|____|____|____|____|____|____|XX__|XX__|____|____| 599_2 = 1985,2
54 |____|____|____|____|____|____|____|_XX_|_XX_|____|____| 599_3 = 1985,3
55 |____|____|____|____|____|____|____|__XX|__XX|____|____| 599_4 = 1985,4
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56 |____|____|____|____|____|____|____|___X|X__X|X___|____| 600_1 = 1986,1
57 |____|____|____|____|____|____|____|____|XX__|XX__|____| 600_2 = 1986,2
58 |____|____|____|____|____|____|____|____|_XX_|_XX_|____| 600_3 = 1986,3
59 |____|____|____|____|____|____|____|____|__XX|__XX|____| 600_4 = 1986,4
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60 |____|____|____|____|____|____|____|____|___X|X__X|X___|____| 601_1 = 1987,1
61 |____|____|____|____|____|____|____|____|____|XX__|XX__|____| 601_2 = 1987,2
62 |____|____|____|____|____|____|____|____|____|_XX_|_XX_|____| 601_3 = 1987,3
63 |____|____|____|____|____|____|____|____|____|__XX|__XX|____| 601_4 = 1987,4

面板文件通过关联LFS常规访谈轮次中的四次访谈创建。上表中，可连接所有标记为X的组别（行）。第1组因访谈始于1971年第四季度被移除；参与四次访谈为筛选标准，未参与第四次访谈者均被排除。1975年SSB调整抽样策略，1973或1974年启动、本应在1975年进行一次及以上访谈的组别被移除。

观察特定列（如1983年第一季度）可见，1/4受访者为第四次参与、第三次参与等。某一季度资料总和中，季度权重可使该区块（列）数据与全国数据平衡；若将四个组别合并为年度文件，需将权重除以4以获正确加权数据。面板文件沿横向展开，每个面板含四个季度权重（每季度一个）；虽各权重差异微小，但均独立生成，且仅适用于对应季度数据。加权数据代表约25%的季度总样本，需乘以4以近似全国季度数据——此处“近似”因面板连接涉及特定筛选，或与各季度加权全国数据存在微小差异。

本面板文件涵盖上表第61组，基于1988年文件描述后期创建；原始文件权重适用于月度数据。1988年第一至第二季度间，LFS进行重组，包括启用新文件描述及调整劳动力市场状态编码。本面板文件恰处于变革节点，但仍基本遵循变革准备阶段的文件描述——此为实用考量：9个末次访谈时间从1987年第一季度至1989年第一季度的面板文件被联合编译，由SSB同步传输至NSD。然而，这些面板文件存在两个版本：因劳动力市场状态编码（V009、V036、V073）变更，数据需重新编码以确保1988年第一至第二季度调整前后的可比性。NSD0603提供原始编码数据，NSD0604提供重新编码后的数据（1987-1988年所有编码均与后续编码可比）。