华东师范大学学报(教育科学版) ›› 2021, Vol. 39 ›› Issue (12): 15-27.doi: 10.16382/j.cnki.1000-5560.2021.12.002
谢爱磊, 陈嘉怡
出版日期:
2021-12-01
发布日期:
2021-11-23
基金资助:
Ailei Xie, Jiayi Chen
Online:
2021-12-01
Published:
2021-11-23
摘要:
饱和业已成为判断质性研究质量、说明样本量合理性的重要标准。本文系统梳理了三类饱和概念——理论饱和、主题饱和与数据饱和,指出研究者要考虑自身的整体研究设计以决定采信何种概念。此外,还介绍了三种记录和判断饱和的方法,它们分别是结构性编码本、饱和表以及概念深度量表。其中,结构性编码本较为适合采信演绎主题饱和与数据饱和概念的研究;饱和表主要有主题饱和表和编码饱和表两类,较为适合采信既定主题饱和模式、特别强调既定主题能够得到数据有效支撑的研究;概念深度量表尤为适合采信理论饱和模式的研究。本文指出,“度”的概念较好地把握了饱和的本质特征;质量(充分)而非数量(多少)是饱和的关键;饱和本身应当是具体的方法论实践,重视饱和,并对取得饱和的过程进行清晰陈述,有助于提升质性研究的规范性、透明度、质量和认可度。
谢爱磊, 陈嘉怡. 质性研究的样本量判断——饱和的概念、操作与争议[J]. 华东师范大学学报(教育科学版), 2021, 39(12): 15-27.
Ailei Xie, Jiayi Chen. Determining Sample Size in Qualitative Research: Saturation, its Conceptualization, Operationalization and Relevant Debates[J]. Journal of East China Normal University(Educational Sciences), 2021, 39(12): 15-27.
表 2
质性研究中的样本量:建议与实际"
研究进路 | 教科书建议 | 梅森的研究发现 |
人种志 | 60%:30-50 | |
扎根理论 | 49%:20-30;37%:30-50 | |
现象学 | 100%:5个以上;68%:5-25 | |
叙事研究 | / | |
个案研究 | 中位数:33** | |
质性研究* | 80%:15个以上;50%:50个以下 |
表 4
结构性编码本举例(Roberts et al.,2019)"
编码 | 定义 | 操作性定义 | 适用或不适用的情形 | 例证 |
害怕被 拒斥 | 表现出对被边缘化的焦虑;害怕由于别人的言辞和行动而感到受伤、痛苦或尴尬。 | 基于信念或疑虑、或没有依据的观点、非理性的推断而形成的对彼此的看法。 | 适用:可以是毫无缘故地被嘲笑的病人或者医务工作者。 | 感觉有点羞愧。担心……他们担心医务工作者的排斥…… ACU013 |
自卑感 | 表达感受说自己在一群人中存在差别。 | 提到权力的不平衡,被不平等对待,感觉到世界观等方面的“不同”。 | 适用:表达的是存在于临床医师之间的感受,而不是存在于病人之间的感受。 | 我有一般不和全科医生那么做,这是不是很有趣?我一般不是那么想,但我有点感觉我更懂理疗。我们看起来……水平更高? ACU012 |
…… | …… | …… | …… | …… |
表 7
概念深度量表举例(Nelson,2017)"
标准(证据) | 低(1) | 中(2) | 高(3) |
范围(编码的频率与多样性;数据来源多样性) | 少有例证支持概念;数据类型 单一。 | | 有大量例证支持概念;数据类型多样。 |
复杂性(编码树,观点图,矩阵) | 描述性编码;编码间联系简单; 分析少。 | | 概念网交错;理论类属涵盖一系列编码和概念。 |
微妙性(备忘录,世界 观图) | 概念语言看起来没问题,单向。 | | 概念语言丰富,略显模糊和多面。 |
回应性(文献) | 回应低;涌现的理论与既有文献和理论框架遥远。 | | 回应强;涌现的理论与既有文献有对话;与其他理论框架有联系(变体和创新)。 |
效度 | 理论化程度低;发现对类似处境参与者适用度低。 | | 抽象层面理论化程度高;发现对那些在同一或相似社会环境下的人而言有意义。 |
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