From multivariate to functional data analysis: Fundamentals, recent developments, and emerging areas

Y Li, Y Qiu, Y Xu - Journal of Multivariate Analysis, 2022 - Elsevier
Functional data analysis (FDA), which is a branch of statistics on modeling infinite
dimensional random vectors resided in functional spaces, has become a major research …

Simultaneous inference and uniform test for eigensystems of functional data

L Cai, Q Hu - Computational Statistics & Data Analysis, 2024 - Elsevier
The asymptotically correct confidence interval (CI) and simultaneous confidence band (SCB)
of any individual eigenvalue and eigenfunction are constructed under dense functional data …

STATISTICAL INFERENCE FOR FUNCTIONAL TIME SERIES

C Zhong, L Yang - Statistica Sinica, 2023 - JSTOR
We investigate statistical inference for functional time series by extending the classic
concept of an autocovariance function (ACF) to a functional ACF (FACF). We establish that …

Inference for dependent error functional data with application to event-related potentials

K Huang, S Zheng, L Yang - Test, 2022 - Springer
Estimation and testing is studied for functional data with temporally dependent errors, an
interesting example of which is the event-related potential (ERP). B-spline estimators are …

From sparse to dense functional data: Phase transitions from a simultaneous inference perspective

L Cai, Q Hu - arxiv preprint arxiv:2401.17646, 2024 - arxiv.org
We aim to develop simultaneous inference tools for the mean function of functional data from
sparse to dense. First, we derive a unified Gaussian approximation to construct …

Confidence surfaces for the mean of locally stationary functional time series

H Dette, W Wu - arxiv preprint arxiv:2109.03641, 2021 - arxiv.org
The problem of constructing a simultaneous confidence band for the mean function of a
locally stationary functional time series $\{X_ {i, n}(t)\} _ {i= 1,\ldots, n} $ is challenging as …

Universal nonparametric kernel-type estimators for the mean and covariance functions of a stochastic process

YY Linke, IS Borisov - Theory of Probability & Its Applications, 2024 - SIAM
Let f_1(t),\dots,f_n(t) be independent copies of some as continuous stochastic process f(t),
t∈0,1, which are observed with noise. We consider the problem of nonparametric estimation …

Oracle-efficient global inference for variance function in nonparametric regression with missing covariates

L Cai, S Wang - Statistica Sinica, 2023 - JSTOR
We propose a new bias-corrected spline-kernel estimator and a smooth simultaneous
confidence band (SCB) as a global inference tool for the conditional variance function in a …

Statistical inference and goodness-of-fit test in functional data via error distribution function

C Zhong - Statistics and Computing, 2025 - Springer
A kernel distribution estimator (KDE) is proposed for the error distribution in the functional
data, which is computed from the residuals of the B-spline trajectories over all the …

Oracle-efficient estimation and global inferences for variance function of functional data

L Cai, S Wang - Journal of Statistical Planning and Inference, 2025 - Elsevier
A new two-step reconstruction-based moment estimator and an asymptotically correct
smooth simultaneous confidence band as a global inference tool are proposed for the …