Search Results for author: Axel Munk

Found 11 papers, 6 papers with code

Quick Adaptive Ternary Segmentation: An Efficient Decoding Procedure For Hidden Markov Models

no code implementations29 May 2023 Alexandre Mösching, Housen Li, Axel Munk

Hidden Markov models (HMMs) are characterized by an unobservable (hidden) Markov chain and an observable process, which is a noisy version of the hidden chain.

Analyzing cross-talk between superimposed signals: Vector norm dependent hidden Markov models and applications to ion channels

1 code implementation10 Mar 2021 Laura Jula Vanegas, Benjamin Eltzner, Daniel Rudolf, Miroslav Dura, Stephan E. Lehnart, Axel Munk

We propose and investigate a hidden Markov model (HMM) for the analysis of dependent, aggregated, superimposed two-state signal recordings.

Methodology

The ultrametric Gromov-Wasserstein distance

1 code implementation14 Jan 2021 Facundo Mémoli, Axel Munk, Zhengchao Wan, Christoph Weitkamp

In this paper, we investigate compact ultrametric measure spaces which form a subset $\mathcal{U}^w$ of the collection of all metric measure spaces $\mathcal{M}^w$.

Metric Geometry Populations and Evolution

Randomised Wasserstein Barycenter Computation: Resampling with Statistical Guarantees

1 code implementation11 Dec 2020 Florian Heinemann, Axel Munk, Yoav Zemel

We propose a hybrid resampling method to approximate finitely supported Wasserstein barycenters on large-scale datasets, which can be combined with any exact solver.

Computation Methodology 62G99, 65C60, 62P10, 90C08

Variational multiscale nonparametric regression: Algorithms

2 code implementations20 Oct 2020 Miguel del Alamo, Housen Li, Axel Munk, Frank Werner

Many modern statistically efficient methods come with tremendous computational challenges, often leading to large scale optimization problems.

Computation Optimization and Control 62G05, 68U10

Optimistic search: Change point estimation for large-scale data via adaptive logarithmic queries

no code implementations20 Oct 2020 Solt Kovács, Housen Li, Lorenz Haubner, Axel Munk, Peter Bühlmann

Change point estimation is often formulated as a search for the maximum of a gain function describing improved fits when segmenting the data.

Change Point Detection

Multiscale quantile segmentation

1 code implementation25 Feb 2019 Laura Jula Vanegas, Merle Behr, Axel Munk

We introduce a new methodology for analyzing serial data by quantile regression assuming that the underlying quantile function consists of constant segments.

Methodology 62G08, 62G15, 62G30, 62G35, 90C39

Frame-constrained Total Variation Regularization for White Noise Regression

2 code implementations5 Jul 2018 Miguel del Álamo, Housen Li, Axel Munk

Despite the popularity and practical success of total variation (TV) regularization for function estimation, surprisingly little is known about its theoretical performance in a statistical setting.

Statistics Theory Statistics Theory 62G05, 62M40, 62G20

Minimax estimation in linear models with unknown design over finite alphabets

no code implementations11 Nov 2017 Merle Behr, Axel Munk

To this end we quantify in the noiseless case, that is, Z = 0, the perturbation range of Y in order to obtain stable recovery of F and W. Based on this, we derive an iterative Lloyd's type estimation procedure that attains minimax estimation rates for W and F for Gaussian error matrix Z.

Statistics Theory Statistics Theory Primary 62F12, 62H30, Secondary 62F30, 62J05

The Essential Histogram

no code implementations21 Dec 2016 Housen Li, Axel Munk, Hannes Sieling, Guenther Walther

We define the essential histogram as the histogram in the confidence set with the fewest bins.

Statistics Theory Methodology Statistics Theory 62G10, 62H30

FDR-Control in Multiscale Change-point Segmentation

no code implementations18 Dec 2014 Housen Li, Axel Munk, Hannes Sieling

In this paper, we propose a multiscale segmentation method, FDRSeg, which controls the false discovery rate (FDR) in the sense that the number of false jumps is bounded linearly by the number of true jumps.

Statistics Theory Statistics Theory

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