A Geometric Approach to Visualization of Variability in Functional Data

作者：Xie Weiyi; Kurtek Sebastian^*; Bharath Karthik; Sun Ying

来源：Journal of the American Statistical Association, 2017, 112(519): 979-993.

DOI：10.1080/01621459.2016.1256813

• Amplitude and phase variabilities
• Fisher-Rao metric
• Functional outlier detection
• Square-root slope function

We propose a new method for the construction and visualization of boxplot-type displays for functional data. We use a recent functional data analysis framework, based on a representation of functions called square-root slope functions, to decompose observed variation in functional data into three main components: amplitude, phase, and vertical translation. We then construct separate displays for each component, using the geometry and metric of each representation space, based on a novel definition of the median, the two quartiles, and extreme observations. The outlyingness of functional data is a very complex concept. Thus, we propose to identify outliers based on any of the three main components after decomposition. We provide a variety of visualization tools for the proposed boxplot-type displays including surface plots. We evaluate the proposed method using extensive simulations and then focus our attention on three real data applications including exploratory data analysis of sea surface temperature functions, electrocardiogram functions, and growth curves. Supplementary materials for this article are available online.

• 出版日期2017