Gait Posture. 2013 Jun;38(2):345-8. doi: 10.1016/j.gaitpost.2012.11.006. Epub 2012 Dec 7.
Center of Pressure (CoP) time series exhibit non-stationarity. Most CoP analyses assume a stationary signal, which could lead to measurement inaccuracy. Despite this, few researchers have reported the incidence of CoP non-stationarity or employed procedures to mitigate non-stationarity prior to time-series analysis. Differencing is a pre-processing technique that reduces non-stationarity, though it has only recently been used with CoP data. This study sought to report the incidence of CoP non-stationarity in a sample data set and determine whether differencing mitigated any CoP non-stationarity that was detected. In addition, researchers examined whether analysis of differenced CoP improved the ability to detect age-related changes in postural coordination.
压力中心（CoP）时间序列表现出非平稳性。大多数 CoP 分析假设信号是平稳的，这可能导致测量不准确。尽管如此，很少有研究人员报告过 CoP 非平稳性的发生率，也没有在进行时间序列分析之前采用程序来减轻非平稳性。差分是一种减少非平稳性的预处理技术，尽管它最近才被用于 CoP 数据。本研究旨在报告样本数据集 CoP 非平稳性的发生率，并确定差分是否减轻了检测到的任何 CoP 非平稳性。此外，研究人员还检查了差分 CoP 的分析是否提高了检测姿势协调与年龄相关变化的能力。
