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Assessing Positive Matrix Factorization Model Fit: a New Method to Estimate Uncertainty and Bias in Factor Contributions at the Measurement Time Scale : Volume 9, Issue 2 (22/01/2009)

By Hemann, J. G.

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Book Id: WPLBN0003994950
Format Type: PDF Article :
File Size: Pages 17
Reproduction Date: 2015

Title: Assessing Positive Matrix Factorization Model Fit: a New Method to Estimate Uncertainty and Bias in Factor Contributions at the Measurement Time Scale : Volume 9, Issue 2 (22/01/2009)  
Author: Hemann, J. G.
Volume: Vol. 9, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Miller, S. L., Dutton, S. J., Hannigan, M. P., Brinkman, G. L., Milford, J. B., & Hemann, J. G. (2009). Assessing Positive Matrix Factorization Model Fit: a New Method to Estimate Uncertainty and Bias in Factor Contributions at the Measurement Time Scale : Volume 9, Issue 2 (22/01/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Applied Mathematics, University of Colorado, Boulder, USA. A Positive Matrix Factorization receptor model for aerosol pollution source apportionment was fit to a synthetic dataset simulating one year of daily measurements of ambient PM2.5 concentrations, comprised of 39 chemical species from nine pollutant sources. A novel method was developed to estimate model fit uncertainty and bias at the daily time scale, as related to factor contributions. A circular block bootstrap is used to create replicate datasets, with the same receptor model then fit to the data. Neural networks are trained to classify factors based upon chemical profiles, as opposed to correlating contribution time series, and this classification is used to align factor orderings across the model results associated with the replicate datasets. Factor contribution uncertainty is assessed from the distribution of results associated with each factor. Comparing modeled factors with input factors used to create the synthetic data assesses bias. The results indicate that variability in factor contribution estimates does not necessarily encompass model error: contribution estimates can have small associated variability across results yet also be very biased. These findings are likely dependent on characteristics of the data.

Summary
Assessing positive matrix factorization model fit: a new method to estimate uncertainty and bias in factor contributions at the measurement time scale

Excerpt
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