Results on the PASCAL challenge "Simple causal effects in time series"


Markovsky, Ivan (2008) Results on the PASCAL challenge "Simple causal effects in time series" s.n.

Download

[img] PDF challenge.pdf - Other
Download (163kB)
[img] Other challenge.tar - Other
Download (10kB)

Description/Abstract

A solution to the PASCAL challenge ``Simple causal effects in time series'' (www.causality.inf.ethz.ch) is presented. The data is modeled as a sum of a constant-plus-sin term and a term that is a linear function of a small number of inputs. The problem of identifying such a model from the data is nonconvex in the frequency and phase parameters of the sin and is combinatorial in the number of inputs. The proposed method is suboptimal and exploits several heuristics. First, the problem is split into two phases: 1) identification of the autonomous part and 2) identification of the input dependent part. Second, local optimization method is used to solve the problem in the first phase. Third, l1 regularization is used in order to find a sparse solution in the second phase.

Item Type: Monograph (Project Report)
Keywords: system identification, sparse approximation, l1 regularization
Organisations: Southampton Wireless Group
ePrint ID: 266779
Date :
Date Event
October 2008Accepted/In Press
Date Deposited: 13 Oct 2008 08:35
Last Modified: 17 Apr 2017 18:58
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/266779

Actions (login required)

View Item View Item