两组中断时间序列分析的模型为:Y_{t}=\beta_{0}+\beta_{1}time+\beta_{2}intervention+\beta_{3}post+\beta_{4}group+\beta_{5}group\times time+\beta_{6}group\times intervention+\beta_{7}group\times post 此模型和单组ITSA模型的主要区别在于加入了组别哑变量group。β0,β1,β2和β3是对...
分析的是整体的影响,如果存在多个干预因素,很难得到哪个干预因素对结果影响的重要程度。 三、ITSA 的公式说明: 分段回归 回归截距 回归斜率 四、数据集说明: 对于时间进行归一化处理,公式 = ds - min(ds),保证time是从0开始的一个值(这个是计算β1使用)。 影响因素 intervention 通过(0/1)进行划分,干预前是0...
In this study, TSP implementations i7n Portland, Oregon, were assessed using interrupted time series analysis (ITSA) on month-to-month changes in number of crashes from January 1995 to December 2010. Single-group and controlled ITSA were conducted for all crashes, property-damage-only crashes, ...
中断时间序列分析（ITSA）在评估大规模干预/政策效果时展现优势，特别是当无法获取对照组数据或仅掌握群体层面数据时。其核心在于利用时间序列数据，实现类实验研究设计，克服对照组缺失的问题。以下为ITSA的几个关键点：1. **明确的干预/政策发生时间点**：需确定政策实施的具体时点。2. **等时间间隔的...
中断时间序列分析（Interrupted Time Series Analysis, ITSA），是一种强大的统计工具，无需对照组，仅依赖时间序列数据即可进行大规模干预效应评估。其核心要素包括：明确的干预节点、干预前后多次观测的数据点以及结果变量与时间的线性关系。通过分段回归，ITSA模型解析为四个关键部分：截距、趋势、即时效应和...
Single-group interrupted time series analysis (ITSA) is a popular evaluation methodology in which a single unit of observation is studied; the outcome variable is serially ordered as a time series, and the intervention is expected to "interrupt" the level and/or trend of the time series, ...
The study utilised an Interrupted Time Series Analysis (ITSA) to assess impacts of the EGMS on monthly cigarette and cigars real excise tax revenue over the period April 2013 to March 2017. The results show that the difference between the pre-intervention and post-intervention slopes of the ...
Using independent sample t-tests, chi-square tests, and interrupted time series analysis (ITSA), we compared the proportion of hospital revenue, the proportion of visits for treatment, and the average hospitalization days of discharged patients between leading public hospitals and leading private ...
中断时间序列分析（Interrupted Time Series Analysis, ITSA）是利用时间序列数据进行干预效应评估的一种统计方法，其优势在于无需对照组。该方法包含四个基本组成部分：干预的明确时间点、干预前后的多次观测数据，以及结果变量与时间的线性关系。通过分段回归，ITSA模型可以分解为截距、趋势、即时效应和持续效应...
This paper uses a question-and-answer format to present the technical aspects of interrupted time-series analysis (ITSA). Topics include the potential relevance of ITSA to behavioral researchers, serial dependency, time-series models, tests of significance, and sources of ITSA information.关键词:data...