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Items for "time series"

The heat equation given a time series of initial data subject to error

The Cauchy problem for the one-dimensional heat equation asks for solutions u_f(x,t) of ∂ u / ∂ t = ∂²u / ∂ x² on R × [1,∞) with u(x,1) = f(x) on R...

Keywords: heat equation, unknown initial conditions, time series, noisy data, nonparametric estimation

04/2005 | Statistics & Decisions, Oldenbourg Wissenschaftsverlag

On the stochastic behaviour of the run length of EWMA control schemes for the mean of correlated output in the presence of shifts in σ

This paper discusses in detail the impact of shifts on the process variance (σ²) on the run length (RL) of modified upper one-sided EWMA charts for the process mean (μ) when the output is correlated.
Quite apart from the relevance of a process variance change in its own right, a dilation in σ² can cause an undesirable stochastic decrease in the detection speed of some specific shifts in μ...

Keywords: statistical process control, run length, control schemes, time series, stochastic ordering

04/2006 | Statistics & Decisions, Oldenbourg Wissenschaftsverlag

Fetal heart rate variability in growth restricted fetuses

Intrauterine growth restriction (IUGR) remains a major problem in perinatal medicine because of the variety of its underlying causes and the prediction of its outcome...

Keywords: beat-to-beat intervals, fetal magnetocardiography, intrauterine growth restriction, time series

10/2006 | Biomedizinische Technik, Walter de Gruyter

Data mining in medical time series

This article proposes a modular, computer-based methodology to describe and compare medical problems using data mining methods...

Keywords: classification problems, Data Mining, EMG, gait analysis, interpretability, pattern recognition, time series