手法を比較

	縦断的定量的内容分析	パネル調査
分野	研究デザイン	研究デザイン
系統	Process / pipeline	Process / pipeline
提唱年	1950s onward; longitudinal application widely adopted in media research by the 1970s–1980s	1970s-1980s (econometric formalization); earlier social survey use from 1940s
提唱者	Developed within communication and media studies; codified by Berelson (1952) and extended by Riffe, Lacy, Fico	Social science and econometric traditions; systematized by Cheng Hsiao and others from the 1970s-1980s
種類	Quantitative observational research design	Quantitative longitudinal observational design
原典	Riffe, D., Lacy, S., Watson, B., & Fico, F. (2019). Analyzing Media Messages: Using Quantitative Content Analysis in Research (4th ed.). Routledge. ISBN: 9781138490536	Hsiao, C. (2003). Analysis of Panel Data (2nd ed.). Cambridge University Press. ISBN: 978-0521522717
別名	longitudinal content analysis, repeated-measure content analysis, time-series content analysis, longitudinal QCA	panel study, panel survey, longitudinal panel, repeated-measures panel
関連	5	3
概要	Longitudinal quantitative content analysis systematically codes and counts features of texts, images, or media messages gathered at two or more points in time, enabling researchers to track how content changes, how themes rise or fall in prevalence, and how media or institutional messaging responds to external events. The design merges the structured measurement logic of quantitative content analysis with the temporal tracking power of longitudinal observation.	Panel research is a quantitative longitudinal design in which the same individuals, organizations, or other units are measured repeatedly across two or more time points. Unlike cross-sectional surveys that capture a single snapshot, a panel tracks change within units, enabling researchers to separate genuine within-unit change from between-unit differences and to model causal dynamics over time.