题名

所得變數於政治學民意調查研究中之測量與應用

并列篇名

Measurement and Application of Income Variables in Political Science Survey Research

DOI

10.7014/SRMA.2021040002

作者

蔡奇霖(Chi-lin Tsai);蔡宗漢(Tsung-han Tsai)

关键词

收入 ; 所得 ; 民意調查 ; 樣本代表性 ; 測量偏誤 ; income ; earnings ; opinion poll ; sample representativeness ; measurement bias

期刊名称

調查研究-方法與應用

卷期/出版年月

46期(2021 / 04 / 01)

页次

55 - 119

内容语文

繁體中文

中文摘要

所得是人們社會階級與經濟地位的重要表徵,其學理價值不言而喻,因此民意調查經常將所得列為基本變數。然而在實際經驗研究中,所得變數的使用率卻遠低於性別、年齡、學歷等其他基本變數。本文認為資料品質的問題是研究者對所得變數卻步的主因。透過理論探討與實例分析,本文發現民眾的所得高低常與單位無反應相關,導致民調普遍有低估所得水準的傾向;同時,高比例且非隨機的項目無反應也是所得變數的一大問題。對此,本文從調查方法論出發,借鑑歐美實務經驗,提出建議如問項更明確化、追問更標準化、答題更匿名化等供臺灣民調界參考,以改善所得的測量。至於應用方面,當前民調的所得變數雖有上述問題但並非毫無用處。本文的分析顯示受訪者回答的所得高低大致符合其對自身社會階級的主觀認知,因此能與學歷及職業等客觀社會階級變數相輔相成。最後,有鑑於所得變數的項目無反應比例甚高,本文亦對實務上常見的應對方法作一討論,供研究者參考以減少誤用。

英文摘要

As a key indicator of socioeconomic status, income plays an important role in social sciences and has been a routine socio-demographic item on many opinion polls. However, in Taiwanese political science studies, the use of the income item is far less common than the use of other socio-demographics such as gender, age and education. Data quality is arguably a major problem that puts researchers off from using income data from surveys. In this paper, we examine this problem for the purpose of laying the foundations for future research to improve survey measurement and application of income variables. First, we discuss the issues of income measurement at every stage of the survey process from a methodological perspective and with the support of empirical evidence from various fields of literature. In seeking solutions to those issues, we trace the evolution of income measurement of the American National Election Studies from the 1940s onwards, along with several long-standing, large-scale academic survey projects in Europe. This review identifies a number of designs aimed at a more comprehensible wording of the income question, a more standardised procedure to elicit income information, and a more sensible way to keep income responses confidential. We recommend Taiwanese pollsters apply these potentially useful designs in future surveys for better income measurement. Second, we investigate the existing income data of Taiwanese surveys. Our analysis of the 2001-2017 data from Taiwan's Election and Democratization Studies (TEDS) found noticeable discrepancies between official statistics and survey estimates of the average population income. Further analysis suggests that those discrepancies are partly due to the positive correlation between income and unit nonresponse-in line with our previous methodological discussion. In addition, there has been a non-trivial amount of item nonresponse in the income data of TEDS, which adds another layer of complexity to the use of those data in research. We suspect that these problems are not unique to TEDS, but rather common among political opinion polls in Taiwan, because most of them have measured income in a similar way. Despite those problems, we found that the income variables of TEDS are useful as a strong indicator of respondents' subjective socioeconomic status, hence making a good complement to objective indicators such as education and occupation. This finding, together with those aforementioned, provides a general guide to using the existing income data of political surveys in Taiwan: avoid treating them as a measure of absolute wealth, but use them as an indicator of socioeconomic status. In this regard, these income data, though imperfect, should still serve the needs of many social science studies. Last, with respect to using income data of surveys in research, item nonresponse is an inevitable problem. A common practice to handle this problem is the "complete-case method"-that is, excluding non-respondents from analysis and focusing solely on respondents without any missing data. In view of its widespread use, we highlight the pros and cons of this method, and make explicit reference to the condition under which it works and the condition it does not work in, in order to provide researchers a quick guide to making good use of the complete-case method to deal with item nonresponse in income data.

主题分类 社會科學 > 社會科學綜合
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